Is industrial hemp used for cbd oil

Industrial Hemp (Cannabis sativa subsp. sativa) as an Emerging Source for Value-Added Functional Food Ingredients and Nutraceuticals

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Abstract

Industrial hemp (Cannabis sativa L., Cannabaceae) is an ancient cultivated plant originating from Central Asia and historically has been a multi-use crop valued for its fiber, food, and medicinal uses. Various oriental and Asian cultures kept records of its production and numerous uses. Due to the similarities between industrial hemp (fiber and grain) and the narcotic/medical type of Cannabis, the production of industrial hemp was prohibited in most countries, wiping out centuries of learning and genetic resources. In the past two decades, most countries have legalized industrial hemp production, prompting a significant amount of research on the health benefits of hemp and hemp products. Current research is yet to verify the various health claims of the numerous commercially available hemp products. Hence, this review aims to compile recent advances in the science of industrial hemp, with respect to its use as value-added functional food ingredients/nutraceuticals and health benefits, while also highlighting gaps in our current knowledge and avenues of future research on this high-value multi-use plant for the global food chain.

1. Introduction

Industrial hemp (Cannabis sativa L., Cannabaceae) is a versatile herbaceous crop that has been used for fiber, food, and medicinal purposes [1,2]. The cultivation of hemp dates back to China around 2700 BC and is believed to have then expanded across Asia, making its way to Europe 2000–2200 years ago [3,4]. Historically, a multitude of products has been derived from the seeds, fiber, and wooden core of the hemp plant [5]. As a traditional fiber crop, hemp is said to have lined the spine of the first copy of the Bible and set Columbus’s sails with canvas and rope [3,4,5]. As a multi-use crop, hemp is considered one of the oldest plants cultivated to provide nutritional and medicinal benefits [2,6]. The hemp seed, be it raw, cooked, or pressed into oil, has been well documented as a primitive source of fiber, protein, and fat, with high nutritional value [3,6]. Furthermore, properties of hemp have been used to aid in treating and preventing ailments for thousands of years in traditional oriental medicine [3,4]. In recent years, the interest in investigating the potential use of industrial hemp in food and nutraceuticals has been growing ( Figure 1 ).

Number of abstracts in the CAB international database in the last 20 years. The search with the keywords (A) Cannabis sativa + Food, (B) Cannabis sativa + Protein, (C) Cannabis sativa + Oil, (D) Cannabis sativa + Cannabidiol.

1.1. Botany

Most researchers consider that Cannabis has only one species, C. sativa L. In the 1970s, Small and Cronquist [7] separated it into two subspecies: subsp. indica, with relatively high amounts of the psychoactive constituent delta-9-tetra-hydrocannabinol (THC), and subsp. sativa, with low amounts of THC. The two subspecies can be further broken down into wild and domesticated varieties; under subsp. sativa, var. sativa is domesticated and var. spontanea is wild, and under subsp. indica, var. indica is domesticated and var. kafiristanica is wild [7]. According to these systematics, the modern industrial hemp varieties would belong to subsp. sativa, and most medical Cannabis (also called “marijuana”) varieties would belong to subsp. indica. However, there are numerous hybrids blurring the line. A contradiction to the above observation has also been reported [8]. Hemp and medical Cannabis strains with 100% C. indica ancestry possessed higher genetic variance than strains with 100% C. sativa ancestry. Another study using Random Amplified Polymorphic DNA markers of hemp and medical Cannabis also indicated that hemp aligns more with C. indica than C. sativa [9]. Hillig [10] also strongly opposed the C. sativa classification of hemp due to many Asian hemp accessions exhibiting more commonalities with C. indica. Apart from indicating a high admixture between the C. sativa and C. indica genetic pools, these results also suggest that the genetic lineage analysis did not conform to the currently recognized classification, and we may have to revisit the taxonomy of these species to better reflect new genetic information coming to light.

1.2. Sex Expression

Hemp is typically a dioecious, obligate cross-pollinated species with a diploid genome (2n = 20), although monoecious types have been bred. It is genetically complex and therefore has significant variability in phenotype and sex expression [11,12]. Also, research has shown significant intra- and inter-cultivar karyotype variation among eight monoecious and two dioecious cultivars [13]. Plants may be entirely female, entirely male, or a gradient of intermediate [14].

1.3. The Genetic Basis of the Difference between Hemp and Medical Cannabis

Industrial hemp and medical Cannabis have primarily been differentiated by their levels of THC production. The cannabinoids (THC and cannabidiol [CBD, Figure 2 ]) profile and the morphology of the plant are determined by the interaction of genetics and the environment. Genetically, medical Cannabis possesses the BT allele that encodes for tetra-hydrocannabinolic acid synthase, while hemp produces the BD allele encoding for canabidiolic acid (CBDA) synthase [15]. Furthermore, van Bakel et al. [16] studied the transcriptome of female flowers from hemp and medical Cannabis, concluding that there was an up-regulation in the entire THC production pathway in medical Cannabis compared to hemp. This difference translates to producing upwards of 10% THC in many medical Cannabis samples, whereas most hemp samples have a total THC level of 0.3% or less [17]. Some preliminary studies indicated 27% genetic variation between hemp and medical Cannabis samples using Amplified Fragment Length Polymorphisms and genetic variance in certain genomic regions [18,19].

Chemical structures of selected biologically active compounds of industrial hemp. (A) Linoleic acid (omega-6 polyunsaturated fatty acid [PUFA]), (B) alpha-Linolenic acid (omega-3 PUFA), (C) Tocopherol, (D) Cannabidiol (CBD), (E) Cannabisin A, and (F) Caffeoyltyramine.

Recent research indicates genome-wide differences that are not confined to the THC biosynthetic pathway [8]. A principal component analysis plot of 81 medical Cannabis and 43 hemp samples obtained from 14,301 single-nucleotide polymorphisms indicated a clear genetic structural difference between hemp and medical Cannabis samples. The hemp samples were more heterogenous than medical Cannabis, indicating the hemp samples came from a wide genome pool, whereas the medical Cannabis samples had a relatively narrow genetic base [8]. Though there are known genetic structural differences, a detailed examination of the genes involved in differentiation, and their corresponding phenotype changes, will provide more input into the genetic basis of the differences between hemp and medical Cannabis. Hemp is resurging in cultivation and production, so care must be taken to conserve the genetic diversity to ensure the long-term survival of the crop.

This review surveys the composition of hemp (both the major nutritive components and the bioactive phytochemicals), as well as their collective health benefits. The aim of this paper is to provide a comprehensive review of hemp seed as a source of value-added or functional food ingredients that is inclusive of its constituents and the role they play in the prevention and treatment of disorders and diseases.

2. Hemp Industrial Products

There are various industrial or economic products of hemp. Industrial hemp comprises fiber and oilseed hemp. Fiber hemp is currently considered a niche crop and is grown in temperate regions. Hemp seed (grain) and its derivatives have also gained popularity among consumers and have multiple uses.

It is estimated that the hemp market entails more than 25,000 products, ranging from textiles, clothing, rope, home furnishings, industrial oils, cosmetics, to food and pharmaceuticals [4,20,21]. The durability and high strength properties of the cellulose-rich fiber from the stalk make it a valuable product for rope, paper, construction, and reinforcement materials [1,3,4,22]. Hemp seeds have high nutritional value and pharmacological properties [2,22]. Within the last decade, hemp seed products have expanded to include a range of food and beverages, nutritional supplements, alternative protein sources, and pharmaceuticals [2,20]. In fact, hemp seed’s utility as a functional food ingredient is currently witnessing a revival of old medicinal applications, as its metabolites have shown potent biological activities [1].

2.1. Crop Production

The cultivation of industrial hemp is more efficient and less environmentally degrading than that of many other crops [5]. Hemp can be grown under a variety of agro-ecological conditions and has a capacity to grow quickly, especially after the first 4–5 weeks after emergence, making it an excellent candidate for carbon sequestration [4,5,23]. Hemp grows best in sandy loam with good water retention and drainage at temperatures between 16–27 °C, in nutrient balanced soil (especially nitrogen, phosphorus, potassium, magnesium, copper, and others). The planting density depends on the type of crop. Fiber hemp does well in high density to encourage stalk growth, but oilseed and CBD hemp should be planted farther apart to encourage greater branching and flower yields [23]. Densely seeded fiber varieties may reach 5–6 m tall, while some recent grain varieties may only reach 1–1.2 m tall. Many multiple-use or resin cultivars are intermediate in height. Industrial hemp is either harvested for the stalk or seeds, whereas the flowering buds are collected from the narcotic type cultivars [18,23,24,25]. Selection for a specific final product (fiber, seeds, or products from the inflorescences) is reflected in the plant architecture of available varieties and clones [14]. However, architecture also strongly depends on plant density, day length, and nutrients and moisture available in the soil [26].

As a fiber crop, hemp provides a high yield; it produces 250% more fiber than cotton and 600% more fiber than flax, from the same acreage [5,21]. Due to the fast-growing, dense canopy, fiber hemp is a natural weed suppressor and could be grown without herbicides; it also suppresses levels of fungi and nematodes in the soil and can be grown without fungicides or pesticides [5,21,23,24]. Hemp contributes to the maintenance of soil quality by its anchored roots, which prevent soil erosion and nutrient leaching, may extract nutrients from deeper soil layers, and are effective for phytoremediation by absorbing heavy metal contaminants from the soil and storing them within the plant. The continual shedding of leaves through the growing season adds moist organic matter to the soil [1,4,21]. Because of the functions in improving the soil quality, hemp is a prime candidate to be used for crop rotation programs to improve the yield of the main crop [23]. Despite the historical functionality of this multi-purpose crop, global hemp production declined in the 19th century, and still only comprises about 0.5% of the total production of natural fibers [27].

2.2. History of Hemp Production

Industrial hemp has been grown as a commodity fiber crop in North America since the mid-18th century until the 1930s. Hemp fell under the umbrella of “marijuana” in the 1930s, and its production was prohibited in Canada under the Narcotics Control Act [3,22,24]. Industrial hemp production acreage and industry rapidly declined in the USA following the Marihuana (SIC) Tax Act of 1937 [28]. However, with the onset of WWII, prohibition was lifted temporarily, when imports of other sources of fiber were unavailable [3]. As an important historical note, hemp was of such necessity to the war effort that the United States Department of Agriculture (USDA) produced an educational video “Hemp for Victory” to encourage farmers to grow hemp [29]. The prohibition was then renewed after the war, and investments in the industry dwindled and were deferred to other crops [3,21,27]. Hemp production generally ceased in North America but continued to a limited extent in Eastern Europe, China, Soviet Union, France, and Spain, where industrial hemp was not prohibited [28]. Hemp production decreased in Europe and the Americas in the late 19th century due to several factors including the replacement of sail ships with steamships, the availability of abaca fiber and rope, and the availability of other less expensive and softer fibers such as cotton. In addition, synthetic fibers such as polyester, nylon, and acrylic were invented in the 1930s and 1940s, and became major fiber competitors after WWII [28]. In 1998, the 60-year hemp production ban was revoked, and under a closely monitored Industrial Hemp Regulation Program, hemp cultivation commenced in Canada [24].

In terms of prohibition, industrial hemp was guilty by its association with medical Cannabis [22]. As mentioned above, both hemp and medical Cannabis belong to the same plant species Cannabis sativa L. but are cultivated differently and vary in their phytochemical constituents [20]. In North America and most of Europe, the industrial hemp must not contain more than 0.3% THC in dried herbage [2,17,20,24]. In some countries such as France, this limit was set at 0.2% THC. In the USA, the 2014 Farm Bill permitted “Institutions of higher education” and state agriculture departments to grow hemp under a pilot program if state law permitted it; however, some production aspects were still subject to Drug Enforcement Administration oversight [30]. Before this, all hemp subspecies and varieties were considered Schedule I controlled substances. The 2018 Farm Bill legalized the production of hemp as an agricultural commodity, removed hemp from the list of controlled substances, and listed it as a covered commodity crop under crop insurance [31].

Currently, fiber and grain hemp are minor crops around the world. However, in the last few years, the production of CBD has made hemp one of the most high-value crops. CBD hemp is becoming a major commodity crop in some states in the USA. Moreover, the increased use of Cannabis in the western world as a psychoactive modulatory drug has changed the public perception of hemp.

2.3. Industrial Hemp Market

Globally, the industrial hemp market remains in China, where approximately half of the world’s fiber hemp supply is produced [20]. The resurgence of interest in hemp crop can be attributed to the demand for sustainable agricultural practices, along with the recognition of hemp’s superior fiber content and nutritional profile. Primarily in central and western Canada, 340 cultivation licenses were issued to farmers who grew more than 39,000 acres of industrial hemp in 2011 [24,32]. In 2018, there were over 77,000 acres used for hemp production [33]. Since the beginning of state pilot programs to produce industrial hemp in the USA in 2014, the total acreage has increased from 0 to over 90,000, and the number of license holders increased from 292 to 3852 by 2018 [34]. Since the implementation of the 2018 Farm Bill, the acreage has increased even further, to over 146,000 by the end of 2019. Future economic prospects for the crop are unclear; there is competition for land with other crops as well as with medical Cannabis, which can pose an issue due to its ability to crossbreed with hemp, causing issues with the THC content in both crops. There is also global competition; production is increasing rapidly in many places and may exceed demand, driving down profits for hemp [34].

3. Hemp Seed Composition

When hemp cultivars are grown primarily for fiber, harvesting is done at the flowering stage, and seeds are not collected. Recently, the production of industrial hemp for the seed has gained interest due to the macronutrients and phytochemicals. Hemp seed is a balanced health product with bioactive components that have the capacity to aid health beyond that of basic nutrition [2,3].

3.1. Nutrients

The major constituents of hemp seed include easily digestible protein (20–25%), polyunsaturated fatty acid (PUFA), abundant lipids (25–35%), and carbohydrates (20–30%) high in insoluble fiber ( Table 1 ) [2,3,6,22,35,36,37]. Hemp seed protein is well-suited for human and animal consumption, consisting mainly of high-quality, easily digestible proteins edestin, and albumin, which are abundant with essential amino acids [2,3,6,22]. The rich source of PUFA, linoleic acid (LA; omega-6) and alpha-linolenic acid (ALA; omega-3), is favorable and regarded as balanced for human nutrition at a ratio of 3:1 [2,22,38,39]. LA concentrations range from 64 to 72% of the total fatty-acid composition. This range can be a result of the variation of different hemp cultivars, cultivation techniques, as well as processing and storage conditions. These fatty acids must be acquired from the diet, as they are needed for proper nutrition but cannot be synthesized endogenously [2,22,35,40,41]. Nutritional recommendations indicate that 15–20% of daily caloric intake should come from fats, and approximately one-third of these fats should be essential fatty acids in a 3:1 ratio. It is estimated that this dietary goal can be met with three tablespoons of hemp seed oil [42,43].

Table 1

Important major and minor constituents of hemp seed and hemp seed oil.

Product Compound Content References
Hemp seed Carbohydrate 20–30 † ; 27.6 † [3,35]
Crude fat 25–35 † ; 33.2 † ; 30.4 † ; 31.1 † [2,35,36,37]
Crude protein 20–25 † ; 24.8 † ; 24.9 † ; 24.0 † ; 27.3 † [2,3,35,36,37]
Neutral detergent fiber 37.2 † ; 32.1 † ; 38.1 † [2,36,37]
Acid detergent fiber 23.5 † ; 29.6 † [2,36]
Ash 5.6 † ; 5.8 † ; 4.8 † ; 5.9 † [2,3,36,37]
Hemp seed oil Cannabidiol (CBD) 10 ‡ ; 4.18–243.68 ‡ [43,44]
Linoleic acid (omega-6 PUFA) 52–62 § ; 53.4 § ; 16.84 † ; 56.2 ¶ ; 56.07 § [2,41,43,44,45]
Alpha-linolenic acid (omega-3 PUFA) 12–23 § ; 15.1 § ; 6.8 † ; 17.2 ¶ ; 15.98 § [2,41,43,44,45]
Beta-tocopherol 6 ‡ ; 1.6 ‡ ; 0.64 ‡ [41,45,46]
Gamma-tocopherol 733 ‡ ; 216.8 ‡ ; 91.57 ‡ [41,45,46]
Alpha-tocopherol 34 ‡ ; 18.2 ‡ ; 19.74 ‡ [41,45,46]
Delta-tocopherol 25 ‡ ; 12.0 ‡ ; 2.09 ‡ [41,45,46]

† , % Hemp seed fresh weight; ‡ , mg/kg Hemp seed oil; § , % Total fatty acids; ¶ , % Hemp seed oil. PUFA, polyunsaturated fatty acid.

3.2. Phytocannabinoids and Endocannabinoid System

Hemp flowers and herbage contain valuable phytocannabinoids, which are naturally occurring cannabinoids that are unique to the Cannabis plant [17]. All industrial hemp varieties contain THC, CBD, and other cannabinoids, although the concentrations in some varieties are very low to non-detectable. In northern latitudes, industrial hemp has a particularly high content of CBD and low content of THC [43,47]. CBD content is higher than THC, and CBD can be detected at relatively low levels in hemp seed oil ( Table 1 ). This is because the production and storage of CBD and THC are in the glandular structures of the plant. The wide range of CBD content detected ( Table 1 ) is primarily due to the amount of resin retained by the seed coat during processing, as well as the varying hemp varieties and their associated cultivation conditions [1,25,43,44]. However, the presence of CBD, even in trace amounts, is speculated to provide certain health benefits [1,3,43,44].

The biosynthesis of CBD begins with the polyketide pathway and the plastidal 2-C-methyl-D-erythritol 4-phosphate pathway, which lead to the synthesis of olivetolic acid and geranyl diphosphate, respectively. These precursors undergo condensation to form cannabigerolic acid (CBGA), which is then converted to cannabidiolic acid (CBDA). Decarboxylation of CBDA occurs spontaneously or with the addition of heat to form CBD [1,43,47]. The health benefits of hemp are primarily focused around CBD; however, over 100 cannabinoids are reported to present in Cannabis species [48]. These phytocannabinoids can be classified into 11 different classes, namely: (−)-delta-9-trans-tetrahydrocannabinol (Δ9-THC), (−)-delta-8-trans-tetrahydrocannabinol (Δ8-THC), cannabigerol (CBG), cannabichromene (CBC), CBD, cannabinodiol (CBND), cannabielsoin (CBE), cannabicyclol (CBL), cannabinol (CBN), cannabitriol (CBT) and miscellaneous-type cannabinoids. Recently, besides THC and CBD, 30 other cannabinoids from commercial hemp seed oil have been identified using high-resolution mass spectrometry [49].

The endocannabinoid system of humans is an endogenous signaling system consists of endocannabinoids, enzymes involved in their synthesis and degradation, cannabinoid receptors, and other associated elements [50,51]. The system is modulated by diet, sleep, exercise, stress, among many others. The endocannabinoids are fatty-acid-derived neurotransmitters that act as signal molecules of coordinating intercellular communication across all physiological systems. One of the primary functions of the system is to restore homeostasis following cellular stressors. The two most studied endocannabinoids are anandamide-N-arachidonylethanolamine (AEA) and 2-arachidonylglycerol (2-AG). Phytocannabinoids are recognized as pharmacologically active compounds, which function by interacting with the endocannabinoid system in humans [1,52]. Cannabinoid receptors are 7-transmembrane-domain G-protein-coupled receptors. Two cannabinoid receptors have been identified: the central CB1 receptor and the peripheral CB2 receptor [53]. The CB1 receptor is primarily present in the brain and spinal cord but also found on certain cells of the immune system, adipose tissues, liver, muscle, reproductive cells, kidney, and lungs. CB1 mediates the release of neurotransmitters such as acetylcholine, noradrenaline, dopamine, gamma-aminobutyric acid (GABA), and glutamate. The CB2 receptor is expressed mainly in the cells in the periphery, in the organs of the immune system and have a role in the release of cytokines and the modulation of immune cell migration [53,54,55] but not psychoactivity [54]. The diversified physiological effects of endocannabinoids take place when they bind to and activate these receptors.

The pharmacology or interaction of THC and CBD with the endocannabinoid system is not yet fully understood and seems complicated. THC has been shown to provide most of the psychoactive effects through the CB1 receptor as an agonist; however, under certain conditions, THC act as an antagonist of the CB1 receptor and also shown to interact with CB2 receptor [54,55]. Interaction of THC with CB1 receptor inhibits ongoing neurotransmitter release; however, repeated administration of THC may nullify its effect as well as the action of endocannabinoids [55]. In contrast, CBD has minimal direct activity at CB1 and CB2 receptors; therefore, no psychoactive activity similar to THC. Though CBD has a very low affinity for CB1 and CB2 receptors, CBD can bind these receptors [56]. CBD antagonizes synthetic agonists of CB1 and CB2 receptors and can be considered to be a negative allosteric modulator of CB1 and CB2 receptors. Moreover, recent findings also indicate that CBD exhibits various dose-dependent physiological responses. Though the low doses (30 mg oral) has no intoxicating effects, high doses (300 mg oral) increased somnolence and reduced anxiety [55]. Moreover, the biological activity of CBD seems to be complex due to its complex pharmacological actions, such as inhibition of endocannabinoid reuptake and increasing the activity of serotonin 5-HT1A receptors, binding to non-cannabinoid receptors such as transient receptor potential vanilloid 1 (TRPV1), peroxisome proliferator-activated receptor-γ (PPARγ), and the orphan receptor G protein-coupled receptor 55 (GPR55) [51,55,57]. CBD has recently received increasing interest since chronic administration of CBD has shown potential therapeutic properties such as antiepileptic, anxiolytic, antipsychotic, neuroprotective activities, and benefits against disorders of motility and epilepsy [55,56,58].

3.3. Hemp Seed Oil

Hemp seed oil contains tocopherol isomers beta-tocopherol, gamma-tocopherol, alpha-tocopherol, and delta-tocopherol, with the gamma-tocopherol derivative present in the highest quantity ( Table 1 ) [2,41,45]. Tocopherols are natural antioxidants that can reduce the risk of oxidative degeneration related disorders [2,41]. In addition, terpenes and polyphenols have been detected, which contribute to the odor/flavor and intrinsic antioxidant activity, respectively [1,2]. Among phenolic compounds, flavonoids, such as flavanones, flavonols, flavanols, and isoflavones were the most abundant [46]. The reported phytochemical contents of hemp seed oil vary due to a broad range of existing hemp cultivars, which are grown and processed under diverse conditions.

4. Potential Health Benefits

Numerous health benefits and potential therapies are reported for hemp seed. Hemp seed delivers a desirable ratio of omega-6 to omega-3 PUFA ( Figure 2 ), which can improve cardiovascular health, reduce osteoporosis symptoms, and diminish eczema conditions. CBD exerts pharmacological properties that make it a potential therapeutic agent for central nervous system diseases, such as epilepsy, neurodegenerative diseases, and multiple sclerosis (MS) [1,59].

4.1. Cardiovascular Health

The dietary intervention of hemp seed for cardiovascular health has been examined. Schwab et al. [60] supplemented the human diet with 30 mL of hemp seed oil daily for four weeks and detected positive changes in the serum lipid profile. Another study also noted that rats fed a 5% or 10% hemp seed-supplemented diet for 12 weeks experienced an elevation in plasma LA and ALA levels [61]. After the diet, post-ischemic heart performance was assessed; the heart’s ability to recover from ischemia-reperfusion insult appeared to be directly related to the hemp seed’s PUFA. Richard, Ganguly, Steigerwald, Al-Khalifa, and Pierce [62] also found that the integration of hemp seed into the rat diet significantly increased plasma LA and ALA levels. As a result, platelet aggregation was inhibited and slowed to a lower rate. The diminished likelihood of clot formation has implications for reducing the incidences of myocardial infarctions and strokes [62]. Prociuk et al. [63] reported similar findings after examining the effect of dietary hemp seed for eight weeks in rabbits. Elevated plasma levels of PUFAs indirectly decreased the risk of platelet aggregation and myocardial infarction and provided better defense against hypercholesterolemia [63]. Other issues caused by hypercholesteremia that were improved by supplementing hemp seed, including decreased cholesterol, low-density lipoprotein, and triglyceride levels, increased high-density lipoprotein levels, lower plaque, and fat deposition, and lower arterial wall damage [64].

4.2. Cancers

Since the first study exhibiting the anti-cancer effects of Cannabis phytochemicals by Munson, Harris, Friedman, Dewey, and Carchman [65], there have been major advances in understanding the mechanisms and targeting action of cannabinoids. Evidence suggests that phyto-, endo-, and synthetic cannabinoids contain properties that aid in the treatment of the brain, prostate, breast, skin, pancreas, and colon cancer. Both in vitro and in vivo models suggest cannabinoids play a role in regulating cellular mechanisms causing anti-proliferative, anti-metastatic, anti-angiogenic, and pro-apoptotic responses [66,67]. These findings have major implications in oncology, as it has been well established that most cancers originate from uncontrolled or improperly managed cellular growth [67].

Phytocannabinoids demonstrate the potential to inhibit cell growth and induce apoptosis in gliomas. Massi et al. [53] tested the effect of introducing CBD to U87 and U373 human glioma cell lines. In vitro treatment resulted in a reduction in mitochondrial oxidative metabolism and glioma cell viability. It was also confirmed that CBD induced apoptosis. When a CB2 receptor antagonist was introduced to the glioma cell lines, the antiproliferative effect of CBD was hindered, revealing its mechanism of action [53]. Vaccani, Massi, Colombo, Rubino, and Parolaro [68] also looked at the implications of CBD on the U87 glioma cell line, where an anti-metastatic result was observed due to the inhibition of cell migration. Cannabinoids have also been found to prevent the differentiation and proliferation of glioma stem-like cells, which may help treat the difficult-to-eliminate nature of gliomas [69].

The treatment of prostate and breast cancers with CBD have also been explored. Sarfaraz et al. [67] found that androgen-responsive human prostate carcinoma cells treated with CBD exhibited a pro-apoptotic response, inhibited cell growth, and a lowered secretion of prostate-specific antigen, which is typically elevated in cancerous cells [67]. Of several natural cannabinoids tested, a CBD extract provided the most potent cytotoxic effects against breast cancer cells, with significantly lower damage to healthy cells [70]. CBD induced apoptosis in a breast cancer cell line via the activation of the overexpressed CB2 receptor [70,71].

Other studies have explored cannabinoid therapy in skin, pancreas, and colon cancers. Blázquez et al. [72] evaluated cannabinoid receptor agonists in mice and found that the activation of these receptors decreased the growth, proliferation, angiogenesis, and metastasis of melanomas. Through similar actions, cannabinoids induced apoptosis in pancreatic tumor cell lines, and the effects were lessened when the CB2 receptors were blocked [73]. Promising results were found in vivo by Ferro et al. [74], where mice with pancreatic ductal adenocarcinoma treated with gemcitabine and CBD survived nearly three times as long as mice treated only with gemcitabine or with a vehicle. This was achieved through interference with the G-coupled protein receptor GPR55, resulting in the prevention of growth and cell cycle arrest [74]. Cianchi et al. [75] investigated the activation of the cannabinoid receptors in colorectal cancer and demonstrated similar apoptotic mechanisms to pancreatic and melanoma cancers.

The strategic elimination of these cancer cells, while inflicting limited harm to normal cells, shows potential for CBD mediation. Although the range of cancers therapeutically affected by cannabinoids is promising, further investigations are required to interpret the growth-inhibitory action of CBD. The results presented here reinforce that much of the CBD effect is mediated through the activation of CB2 receptors and that the possible application of CBD in cancer cytotoxicity is vast.

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4.3. Diseases of the Central Nervous System

Several phytocannabinoids have exhibited the ability to mediate symptoms of neurodegenerative diseases and reduce compromising damage. Hypoxic-ischemic (HI) brain injury results when the brain is deprived of oxygen and can lead to neurological impairments such as epilepsy, developmental delay, as well as reduced motor and cognitive function. Castillo, Tolón, Fernández-Ruiz, Romero, and Martinez-Orgado [76] found that CBD enhanced neuroprotection in mice that experienced induced HI by oxygen and glucose withdrawal. Pazos et al. [77] tested rats that underwent HI injury and subsequently received CBD treatment; the common measures of HI damage, infarct volume, and histological evaluation indicated CBD provided neuroprotection. Later, Pazos et al. [78] studied HI in a pig model by reducing carotid blood flow and then administering CBD treatment [78]. The neuroprotective action was attributed to the prevention of an increase in excitotoxicity, oxidative stress, and inflammation, and CB2 receptors were associated with these effects [77,78]. Treatment with CBD prevents emotional and cognitive impairments, injury to white matter, degeneration of hippocampus tissue, and glial cell response decrease that result from brain ischemia, as well as promotes recovery through hippocampus dendritic cell reconstruction and neurogenesis in mice that already have brain ischemia [79].

The most prevalent neurological disease, epilepsy, has also benefited from CBD. Jones et al. [80] examined seizure activity and found that CBD exerted anticonvulsant properties. Jones et al. [81] reconfirmed these findings using an acute pilocarpine model of temporal lobe seizure and the penicillin model of the partial seizure. Both studies found a decrease in both the severity and mortality of the seizures [80,81]. Intervention with CBD is even beneficial to people who have treatment-resistant epilepsy; adverse events, severity, and frequency of seizures were significantly and sustainably reduced with long-term treatment [82].

Several clinical studies have outlined the cannabinoid treatment of spasticity, pain, and hindered bladder control symptoms associated with MS patients. A novel cannabinoid therapy, THC/CBD oromucosal spray (Sativex™), has been introduced to patients suffering from neuropathic pain that can be difficult to manage with normal pharmaceuticals. A placebo-controlled study found that the spray was able to lessen MS-induced neuropathic pain [83]. The same spray was evaluated for symptomatic relief and was found to cause a decline in spasticity occurrence and severity, and had limited adverse side effects on cognition [84]. This could be due to the critical part CBD plays in diminishing the psychoactive effects of THC. A similar spray provided to MS patients effectively reduced pain and sleep disturbance [85]. When MS patients were provided with THC/CBD extract capsules, daily self-reports of spasm frequency, mobility, and ability to fall asleep were favorably impacted in the active treatment group [86].

Limited research has been done on CBDs effect on Parkinson’s disease symptoms, though the current evidence suggests it can improve the non-mobility related symptoms, there is contradicting evidence on its effects on mobility and cognition symptoms [87]. Further studies need to be conducted to determine the true extent of CBD treatment on Parkinson’s disease.

The mechanisms by which CBD exerts its neuroprotective effects are not entirely understood; however, CBD is noted for its antioxidant and anti-inflammatory properties [76,80]. Since the activation of CB1 receptors is consequently associated with psychoactive ramifications and potentially neurodegenerative symptoms upon long-term activation, the investigation of CBD is increasingly important for neurological disorders. At present, CBD used therapeutically, either alone or in combination with THC, aids in the treatment and symptomatic relief of several neurodegenerative disorders.

4.4. Rheumatoid Arthritis

In traditional Chinese folk medicine, hemp seed oil has been used to relieve chronic knee pain in patients with rheumatoid arthritis (RA) and improve blood circulation [88]. RA is an autoimmune inflammatory disease primarily characterized by synovial tissue inflammation and hyperplasia [89]. Jeong et al. [90] concluded that hemp seed oil promotes the production of reactive oxygen species (ROS), storage of lipids, production of endoplasmic reticulum stress markers, which act as anti-rheumatoid factors in downstream processes, and improved blood circulation, providing additional relief to RA patients. Hammell et al. [91] found that CBD can positively impact pain caused by arthritis. A rat model was used to examine topical application of CBD: joint swelling, pain scores, synovial membrane thickness, infiltration of immune cells, and inflammation biomarkers were all significantly reduced in a dose-dependent manner [91]. A CBD-based oil was used to treat another kind of arthritis: osteoarthritis in dogs [92]. Dogs receiving treatment exhibited significantly less pain compared to those without treatment, allowing these dogs to be more comfortable and active [92]. Clinical studies on RA patients will provide clarity on the mechanism and biochemistry behind the benefits of hemp seed oil in reducing and ameliorating the symptoms of RA.

4.5. Dermatitis and Skin Diseases

Hemp seed oil can be an effective cure to eczema, as well as a host of other skin related ailments [93]. Hemp seed oil is composed of more than 80% PUFA, and is rich in tocopherols [3,41]. These constituents point to hemp seed oil’s beneficial effects in reducing and eradicating skin diseases, including eczema [94]. A clinical study by Callaway et al. [93] found participants who had a regular dietary intake of hemp seed oil had significantly fewer symptoms of eczema, including skin dryness and itchiness, and they used dermatitis medicine less often. Allergic contact dermatitis has shown preliminary evidence to be mediated through intervention with the endocannabinoid system, making treatment with CBD a promising solution [95]. The presence of high levels of essential PUFAs improves the atopic symptoms of dermatitis [93,96].

4.6. Mental Health and Sleep Disorders

Concentrated CBD from hemp has been shown in both pre-clinical and clinical studies to possess anxiolytic or antianxiety characteristics due to its ameliorating effect on limbic and paralimbic areas of the brain [97,98]. Importantly, the anxiolytic effects of CBD are only induced with low concentrations; high concentrations may cause anxiogenic or panicogenic effects [99]. Treatment doses need to be selected carefully to ensure only anxiolytic benefits are felt by the individual. Other anxiety-related disorders also benefit from treatment with CBD, including post-traumatic stress disorder (PTSD) and depression, as well as addiction recovery [99,100,101]. The endocannabinoid system is involved in learning, emotional responses (including those related to trauma), and regulation of emotional behavior; therefore, this system is an important target for the treatment of PTSD [100]. Using experimental animal models, CBD has been effectively used to treat the development of adverse associations at all steps of the process, including immediately after trauma to prevent the development of PTSD. CBD has been able to help in the extinction process of adverse memories in humans, as well as treat the anxiety-related symptoms accompanying PTSD without causing side effects [100]. In male and female genetically depressive mice, CBD had anti-depressant properties as well as reduced the exhibition of anhedonia [102]. In patients at high risk of psychosis, CBD was able to partially normalize function in regions of the brain associated with psychosis [103]. When administered to sober heroin-addicted individuals, CBD reduced cue-induced cravings and anxiety with short-term 3-day administration, as well as had prolonged benefits up to 1 week after the final treatment dose [104].

CBD has been shown to have therapeutic effects in favorably modifying REM sleep behaviors that may be altered due to insomnia [105]. A study conducted on people experiencing anxiety and sleep issues found that CBD improved sleep quality in the first month, but it did not remain constant throughout the remainder of the study period [106]. There are contradictions in the literature, where some studies have found, as discussed, that CBD can improve sleep; however, there are other studies that find treatment with CBD can improve wakefulness during the day [107]. The mechanisms behind sleep cycle regulation by CBD need to be more thoroughly explored to determine how it can be used to improve both sleep and wakefulness.

Comprehensive research on this topic is required to understand the broad-spectrum effects of hemp-seed-derived CBD-based nutraceuticals on anxiety [108]. Data is especially lacking on the differences between sexes in response to treatment; most pre-clinical studies used only male animals, and clinical studies that include females have yet to evaluate sex-differentiated responses [98]. Males and females experience anxiety differently, and they respond to psychotropics differently, so this is an important knowledge gap to fill with further studies [98]. There is also limited research on CBD treatment for the other anxiety-related disorders discussed above. There are contradictions within the literature on the true benefit of CBD on the treatment of addictions, some of the conflicts are due to the type of drug at the center of the addiction, but there is also lacking consensus within drug types [109].

4.7. Additional Health Benefits

There are other areas of treatment using hemp products that have been explored less extensively than those discussed above. The hemp seed oil has been documented to be therapeutic for constipation problems [110]. Furthermore, mice trials have shown that hemp seed consumption leads to improved memory and learning-induced by chemical drugs [111,112].

CBD has suppressive effects on the immune system, including inflammatory response reduction, cellular and humoral immunity suppression, and induction of apoptosis in some lymphocytes; these effects are beneficial for treating inflammatory diseases [113,114]. Type 1 diabetes is an example of an inflammatory-based disease that can benefit from CBD preemptive treatment; non-obese diabetic mice receiving CBD had delayed development of diabetes, and had significantly lower activation of leukocytes than mice receiving control vehicle [115]. Zhou, Wang, Ji, Lou, and Fan [116] demonstrated anti-neuroinflammatory properties of hemp seed using an experimental mouse model.

Another area of research on the benefits of hemp is pain management. It has been theorized that some pain conditions, including fibromyalgia, migraine, and irritable bowel syndrome, are caused by an endocannabinoid deficiency [117]. Due to this theory, targeting the endocannabinoid system with CBD is a common treatment for symptomatic relief of these conditions [117]. Cannabis has also commonly been used to treat other chronic pain that is not suspected to be caused by an endocannabinoid deficiency; it is the most common reason for medicinal Cannabis usage in the USA [118,119]. Cannabinoids act in many ways to produce an analgesic effect, including preventing the release of neurotransmitters from presynaptic neurons, altering the sensitivity of postsynaptic neurons, activating pain inhibiting pathways, and reducing neural inflammation [119].

The major limitation for the treatment of all previously discussed health conditions is the lack of long-term studies. There has virtually been no research examining the long-term effects, especially of hemp-derived CBD-based treatments. Short-term data shows that it has been well-tolerated and results in minimal adverse side effects [119]. The cannabinoids and terpenes in Cannabis work synergistically together to provide the discussed health benefits in addition to the flavonoids present [118]. In the future, investigations should be conducted to understand the synergistic effect of all the phytochemicals in addition to validating the health benefits of minor constituents of hemp seed.

5. Food and Nutraceutical Applications

Consumers have become increasingly interested in the way their diet can address health deficits and wellbeing. Over a decade ago, two thirds of grocery shoppers reported that their purchases were highly influenced by the pursuit of preventing, managing, or treating a specific health condition [120]. Since then, food scientists have targeted such consumer demands by investigating and advertising additional health benefits and bioactive properties that functional foods provide. In recent years, some unconventional plant-derived oils, such as hemp seed oil, have earned a reputation for providing not only cooking and alimentary services but also providing medicinal and nutraceutical potential [121]. Hemp seed oil is currently advertised primarily as a natural health product for body care purposes, as oil for salad dressings, or to be taken directly as a dietary supplement. The hemp seed oil has a strong susceptibility to rancidity with heat and prolonged storage, which reduces its use as cooking oil [40,120,121]. Because hemp prohibition was only lifted about 20 years ago, only recently that hemp seed has been investigated for its applications in the food and nutraceutical industry for its benefits beyond basic nutrition.

5.1. Hemp Seed in Food Products

In addition to the primary use of hemp seed as oil, it has been used in the milled form as a source of vegetable protein and dietary fiber, facilitating its incorporation into food products such as energy bars, flavored yogurt, baked goods, and more [36,122,123]. Shim [124,125] patented a process of making bread and confectionary from hemp seed oil and hemp seeds, respectively. Guang and Wenwei [126] patented hemp seed flours to be used in functional foods that aid in the prevention of certain diseases by increasing the levels of high-density lipoprotein (HDL) and stabilizing the levels of other glycerides and lipoproteins. A seasoning sauce from fermented hemp seeds was developed by Metz and Selg-Mann [127], while Steinbach [128] developed a process for producing pralines and chocolates from hemp seed and hemp seed oil. A process was developed for obtaining hemp milk that did not change color or develop bitterness when subjected to pasteurization [129]. Hemp seed as a powder and an additive has been used as a source of protein [130,131]. Furthermore, Guang and Wenwei [132] developed a process for using hemp protein powder in treating anemia. Though the most popular part of the hemp plant to ingest is the seeds, sprouts, leaves, and flowers can also be consumed raw in juice or salads [133]. The inclusion of juice obtained from hemp in alcoholic beverages is speculated to have digestive benefits [134].

Frassinetti et al. [135] examined hemp seeds and sprouts to be rich in beneficial bioactive compounds with both in vitro and ex vivo antioxidant activities. Furthermore, these compounds exhibited an antimutagenic effect on Saccharomyces cerevisiae. The main polyphenols identified in seeds and sprouts exhibiting antioxidant activities were cannabisin A, B, C, and caffeoyltyramine ( Figure 2 ). The two primary compounds identified in sprouts that provide nutraceutical benefits were linoleic acid and gluconic acids, which act as intermediaries in the production of vitamin C [135]. Terpenes, which are also found in hemp, have anti-inflammatory and some antiallergic properties, can treat pain, prevent the production of ROS, and act as potent antioxidants [133]. Due to the presence of a wide variety of nutrients, including high levels of PUFA and essential amino acids, hemp seeds are praised for providing adequate quantities of different nutrients to satisfy human dietary requirements [136,137].

5.2. Advancement in the Extraction of Oil and Cannabinoids from Hemp Seed

There are numerous methods for extraction of hemp seed oil, including cold press, supercritical CO2 extraction, solvent extraction with isopropanol, hexane, dimethyl ether, and numerous pretreatments. However, all of these methods possess different advantages and disadvantages depending on the end use of the product and the extraction fraction in question [138].

Cold-pressed oils from seeds have become more commercially popular since they are viewed as natural and safe products to be used in food [120,139]. Cold-pressing passes the raw seed material through a conventional screw press, without the addition of harsh chemical solvents or high heat treatments [40,120]. This process retains more of the beneficial components of the seeds, including valuable PUFA and bioactive substances, while minimizing degradative changes in the oil [40,120,121,139]. One notable disadvantage of cold-pressed oil is the low yield potential of 60–80% of extractable oil [6].

Soxhlet extraction is the conventional method of extraction; the selected solvent is heated to reflux and floods the solid material, extracting the desired compounds, including volatile compounds [140]. Many solvents have been successfully used to extract hemp seed oil with high yields. N-hexane and petroleum ether [141], dimethyl ether [142], ethanol [143] and isopropanol [144] have been used and optimized with regards to extraction time, temperature, and other extraction conditions.

Another method optimized recently is supercritical fluid extraction, most commonly using CO2. Using the response surface method, Da Porto, Decorti, and Tubaro [145] and Da Porto, Voinovich, Decorti, and Natolino [146] optimized supercritical CO2 extraction of hemp oil; they observed fatty-acid compositions and oxidative stability at different stages of the extraction process while varying the parameters to obtain maximum efficiency of extraction. In addition, Aladić et al. [147] and Tomita et al. [148] further refined the processing temperature, pressure, and time to determine how these conditions affect the constituency of hemp oil, especially focusing on fatty acids, tocopherol, and pigment content. Supercritical CO2 using n-propane as a solvent, reduces the extraction pressure and preserves the physical and nutritional properties of hemp seed oil [144].

There have been many innovations in hemp seed oil extraction. Optimized procedures to extract hemp seed oil rich in CBD by supercritical CO2 are well established [149,150]. To remove pigments and waxes prior to supercritical CO2 extraction, crushed silicon sand and ultrasonic-assisted extraction, respectively, can be used [151,152]. Procedures to extract hemp seed oil free of THC have also been developed to satisfy regulatory requirements and societal concerns. Separation techniques such as chromatographic columns, and stabilization reactions such as oxidation with heat and isomerization with UV light, have been reported [153,154]. Dynamic maceration with ethanol for 45 min is an efficient method to extract non-THC cannabinoids from hemp seed oil [155]. New methods using ultrasonication-assisted extraction are also gaining interest due to minimal intervention with the product and shorter extraction time [156,157]. Similarly, the response surface method has been used to optimize the microwave-assisted extraction of cannabinoids, which also provides a shorter extraction time [158]. Recently, many advances have been made to combine different techniques, such as supercritical fluid extraction, ultrasonication, and microwave-assisted extraction, to increase efficiency [156]. Hemp seed oil extracted through the above methods are different in yield, physical properties, and chemical composition. Furthermore, the cost is also an important factor in the selection of the extraction method. Considering an initial economic cost-benefit analysis, supercritical CO2 extraction is most efficient, followed by Soxhlet extraction and ultrasonication [138]. In terms of scale-up extraction, ultrasonication and Soxhlet extraction are the best methods, while the desirable omega-6 PUFA/omega-3 PUFA ratio can be achieved by the Soxhlet extraction method [138]. Selecting the most appropriate method of extraction depends on the end use and desired bioactives in the final products.

5.3. Methods of Enhancing Oxidative Stability of Hemp Seed Oil

To maintain oxidative stability, it is necessary to monitor the fatty-acid profiles throughout the extraction process to standardize temperature, pressure, and particle size required for supercritical CO2 extraction of hemp seed oil [145,146]. Hemp seed oil can maintain oxidative stability through the presence of tocopherols and polyphenols. Tocopherols effectively stop or slow down the lipoperoxidative radical chain reactions by preventing the oxidation of PUFAs [159]. Furthermore, phytosterol concentrations of approximately 15% also have excellent oxidative prevention functions [160]. Among them, b-sitosterol, campesterol, and D5–avenasterol can withstand high temperatures and reinforce the plasma membranes of eukaryotic cells. Storage studies must be conducted for hemp seed oil while observing the changes in composition and antioxidant activity.

Some research has been done in improving oxidative stability and adhesion of hemp seed oil to surfaces such as skin or hair. A method of saponizing and quarternizing fatty acids [161] resulted in the minimization of oxidation and crosslinking of released essential fatty acids. Many cosmetic formulations of hemp seed oil were prepared with this method to improve adherence to skin. Maintenance of the antioxidant properties of the oil helps regulate oxidative stability as well. Temperature and pressure play a major role in altering oxidative stability; however, there is no universal standard that specifies the optimal conditions for maintaining oxidative stability as it varies greatly between extraction procedures. Hence, it is more likely that optimization at the local process level will help maintain the oxidative stability of hemp seed oil.

5.4. Microencapsulation Technologies

To increase the bioavailability and protect unstable food constituents, such as PUFAs, from oxidation, different types of microencapsulation techniques have been used for plant-based oils [162]. Spray drying [163], freeze-drying [164], fluidized bed coating [165], centrifugal extrusion [166], complex coacervation [167,168], ionotropic gelation [169], liposome entrapment [170], and electrospraying [171] are the most predominant methods used for microencapsulation. Hemp seed oil is a prime candidate for these interventions to increase its nutritional value and benefits. The selection of the shell coating material to protect the core substance during microencapsulation depends on the microencapsulation method, the nature of the core material, the end use of the product, its physicochemical characteristics, and possible interactions with the core material [172].

Nanoencapsulation is remarkable in improving the low water solubility, bioavailability, volatility, and stability of high-value oils [173]. Belščak-Cvitanović et al. [174] concentrated and encapsulated the bioactive compounds extracted from hemp fiber processing waste, also called hemp fiber meal. Hemp fiber meal can be used for isolation of essential amino acids, especially arginine, by using food grade enzymes for polysaccharide digestion; the resulting polysaccharide fragments can be subjected to ultrafiltration and removed to concentrate the protein content, making it a superior isolate compared to other hemp protein products [175].

Considerable evidence of the potential health benefits of hemp seed oil has been uncovered in the past two decades; however, additional investigations are required to use hemp seed oil as a functional food ingredient. The value-added hemp food sector is growing; with increased consumer awareness and product innovation, the health applications of hemp seed oil are expected to expand [24,42].

6. Future Prospects and Conclusions

Since ancient times, hemp has been cultivated to provide nutritional and medicinal benefits. Although the government regulations repressed the cultivation and scientific inquiry of industrial hemp in the past, under recent legalization with stringent production regulations, hemp has proven to hold viable, value-added food and nutraceutical applications ( Figure 3 ). Recently, many studies have demonstrated that the nutrient and bioactive composition of hemp contributes to the prevention and treatment of several ailments suggesting its potential as a valuable functional food ingredient. This review sought to highlight these advances in understanding the medical, nutritional, and nutraceutical benefits of industrial hemp. The ease of production and suitability to many climatic and geographical locations are assets to the expansion of this industrial crop. Due to its versatility, breeding of hemp is underway in many universities and breeding centers across North America and Europe to develop high-yielding varieties for both fiber and oil seed production. This will help standardize varieties across different growing regions, thus maintaining quality and reducing disease and insect pressure. The controversial association of industrial hemp with medical Cannabis has also slowed expansion efforts. Therefore, breeding of hemp to clearly differentiate it from medical Cannabis may accelerate its development and consumer acceptance, as well as ease regulatory barriers of the crop.

Advanced value-added technologies can drive value-added innovation to make use of industrial hemp to introduce a wide array of functional food ingredients and nutraceuticals.

A lot of advances have also been made in the extraction technologies of hemp seed oil and its nutraceutical benefits. However, there is still no industry consensus on the best methods of extraction, as it depends on the scale of production and end-use. The development of standardized processing guidelines for hemp seed and hemp seed oil will help ensure stringent quality control. There are opportunities in food innovation through the incorporation of hemp seed oil and its constituents, especially PUFA and CBD, in mainstream value-added and supplemented food products. Also, there is potential for the use of hemp processing byproducts in various food, feed, and industrial applications.

For innovation of novel hemp-derived food ingredients and nutraceuticals requires precise identification and quantification of major bioactives and standardization of the products. The analytical methods required for bioactives such as CBD need to be standardized. To ensure the authenticity and safety of hemp-derived food and nutraceuticals, it is important to quantify the amount of THC in the final product and includes it in the label. For example, in North America and most of Europe, to classify as industrial hemp, THC content should not exceed 0.3% on a dry weight basis. If the regulatory agencies could make a requirement for declaring THC content, that will help the food and nutraceutical industry to stay away from complicated regulatory issues around medical Cannabis. Since the impact of CBD is dose-dependent, an acceptable limit of CBD to be determined for inclusion in the labels of nutraceuticals and dietary supplements. The manufacturers should be aware that CBD content may change from batch-to-batch due to the variations of sources of materials, growing conditions, and manufacturing. Future investigations should also be aimed at quantification of trace cannabinoids other than THC and CBD and exploring their pharmacological effects. The pharmacokinetics of these bioactives, when incorporated in different food matrices, need to be understood. The inclusion of the content of omega-3 PUFA and omega-6 PUFA and their ratio in the label is useful for consumers to recognize the benefits of hemp oil and other value-added food products.

Most of the health benefits-associated research of industrial hemp has been conducted under pre-clinical conditions. However, due to the possibility of concentrating bioactive phytochemicals during the manufacturing process, the industry should pay attention to the dosing to optimize the potential health benefits and avoid possible safety concerns. There is a need to conduct appropriately designed, randomized, placebo-controlled, double-blind clinical studies on the effects of hemp-derived functional food ingredients and products, dietary supplements, and nutraceuticals on the promotion of human health. The hemp seed oil has potential as a nutraceutical due to the desired ratio of omega-6 PUFA to omega-3 PUFAs, and the bioactive CBD. Future research should focus on exploring other bioactive phytochemicals of industrial hemp, such as polyphenols and isoprenoids. The contribution of polyphenols and isoprenoids of hemp to the sensory quality, shelf life, and health benefits of the final products still to be understood. Overall, the hemp industry is starting to flourish across the globe. Regulatory agencies need to distinguish industrial hemp from medical Cannabis (marijuana), so the economic potential of industrial hemp as a sustainable source of value-added functional food ingredients and nutraceutical products can be realized.

Acknowledgments

Authors wish to thank the Natural Sciences and Engineering Research Council (NSERC) of Canada for their support to train highly qualified personnel. Authors also appreciate the encouragement and in-kind support by the Global Hemp Innovation Center at Oregon State University, Corvallis, OR 97331, USA.

Author Contributions

Conceptualization: H.P.V.R.; writing—original draft preparation: A.D., S.K.K., B.M.; writing—review and editing: H.P.V.R. and V.D.Z.; visualization: H.P.V.R. and V.D.Z.; supervision: H.P.V.R. All authors have read and agreed to the published version of the manuscript.

Funding

This research did not receive any specific grants from funding agencies in the public, commercial, or not-for-profit organization. APC was sponsored by MDPI.

Conflicts of Interest

The authors declare no conflict of interest.

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Articles from Molecules are provided here courtesy of Multidisciplinary Digital Publishing Institute (MDPI)

OSU Extension Catalog

Photo: Stephen Ward, © Oregon State University
Oregon State University hemp leader Jay Noller examines an industrial hemp plant.

Photo: V. Sikora, used with permission
Figure 1. Industrial hemp produces two types of fiber: phloem (bast) and xylem (wood) fiber.

Photos: V. Sikora, used with permission
Figure 2. Male (left) and female (right) hemp plants. Male plants flower and die earlier than female plants.

About this publication

Industrial hemp may only be grown in compliance with applicable state and federal law, including the 2014 and 2018 farm bills and the anticipated U.S. Department of Agriculture regulations. The following information is being provided for educational purposes only to inform licensed growers operating in compliance with applicable state and federal laws. Consult your local authorities, Department of Agriculture representatives, or personal attorney for questions regarding the legality of growing industrial hemp in your jurisdiction.

Introduction

Industrial hemp (Cannabis sativa L.) was grown as a commodity fiber crop in the United States from the mid-18th century until the mid-1930s. As in many other countries, C. sativa was banned and was considered an illegal crop in the U.S. for several decades.

In 2014, Section 7606 of the federal Agricultural Act of 2014, commonly called the Farm Bill, allowed the cultivation of industrial hemp within authorized pilot programs for “the plant Cannabis sativa L. and any part of such plant, whether growing or not, with a delta-9 tetrahydrocannabinol [THC] concentration of not more than 0.3 percent on a dry weight basis.”

The 2018 Farm Bill decriminalized the cultivation of industrial hemp and designated the USDA Agricultural Marketing Service to develop regulations regarding hemp production. At the time of this publication, the guidelines for legal industrial hemp cultivation under the 2018 Farm Bill have not been finalized. Until they are, all rules and restrictions must be followed per Section 7606 of the 2014 Farm Bill. The Food and Drug Administration will also continue to regulate hemp under applicable federal laws.

No one should implement the 2018 Farm Bill production provisions until the USDA rule is finalized. Oregon growers, processors and members of the general public should contact the Oregon Department of Agriculture or consult their legal counsel for further information.

Genetically, industrial hemp belongs to Cannabis sativa, but botanists debate whether it is a single species (Cannabis sativa L.) with several subspecies or one of three species along with C. indica Lam. and C. ruderalis Janisch. Some botanists divide the genus Cannabis into C. sativa (the fiber/grain one), C. indica L. (the drug type) and C. ruderalis Janisch (intermediate, or wild, type). However, people crossbred the three species to obtain hybrids with desirable characteristics, leading some botanists to propose that all the subtypes belong to C. sativa, which could be divided into different subspecies or chemotypes (chemically distinct entities in a plant).

Global importance of industrial hemp

Industrial hemp is a temperate region crop; it grows best in more northern latitudes from the 42nd to 45th parallel. It grows well in the Pacific Northwest.

Industrial hemp is an annual cross-pollinating plant with rapid growth and development that results in significant biomass accumulation. Registered varieties of industrial hemp vary significantly in height and size. Two historical uses of industrial hemp are fiber and food. Industrial hemp seed oil, extracted from the grain, is valued as healthy table oil, and it has many applications in cosmetics, nutraceuticals and functional foods.

In recent years, Cannabis sativa has been rediscovered as a high-value crop and is quickly becoming established in the U.S. C. sativa can be used in many ways, including as a source of natural products of pharmacological interest. The various economic products of C. sativa are the basis for grouping hemp into four categories: (1) fiber hemp, (2) oilseed hemp (3) hemp products for medicinal markets, and (4) hemp products for recreational markets. Fiber and oilseed/grain hemp are collectively known as industrial hemp.

Fiber hemp products

Fiber hemp products historically have included textile, cordage and paper. China is the main producer of fine hemp textile fiber, which is often mixed with other natural fibers in the manufacture of fine linens. Several European Union countries, Eastern Europe, Russia and South Korea also are significant producers of hemp. With consumer preferences worldwide increasingly favoring natural products and production systems that are environmentally friendly, the market for textiles, fabrics and clothing that include fiber hemp has increased significantly.

Fiber hemp is also used in horticultural planting materials; biodegradable mulch; pressed and molded fiber products, including those used in the automobile industry; paper and pulp products (such as hygiene products, banknotes, filters, art papers, tea bags); building-construction products (such as fiberboards and fiber-reinforced cement boards); insulation materials; animal bedding (made from the woody core of the plant called hurds); plastic biocomposites; and compressed cellulose plastics. Due to its high biomass production, hemp shows promise as a bioenergy crop.

Hemp seed or grain

Hemp seed contains 20%–30% edible (fixed) oil; 25%–30% protein, which includes eight of the daily essential amino acids recommended for humans; 20%–25% fiber; 20%–30% carbohydrates; and many essential nutrients and vitamins.

Humans have used hemp seed as food since ancient times. Grain or oilseed hemp products include hemp seed, seed flour, seed protein, seed powder, seed oil, and hemp meal. Nowadays, hemp grain is used in human health food because of the desirable ratio of omega-6 and omega-3 fatty acids in hemp oil. It is not yet legal to feed hemp to animals in the U.S.

Hemp seed oil is used in many cosmetics and as a substitute for other industrial oils. Hemp seed oil has a pleasant flavor and is used like olive oil as table oil and in salad dressing. Hemp seed oil should not be used for frying or baking; when heated at temperatures above 320°F (160°C), flavor declines, and it may produce toxic byproducts. Also, hemp seed and hemp seed oil do not have a long shelf life. Sterilization of hemp seed (which is required in North America when used for consumption) may foster rancidity of the oil within the seed.

Hemp seed should be stored in dark containers and refrigerated to extend the shelf life and preserve the quality. Most of the hemp grain imported in the U.S. comes from Canada, where industrial hemp has been legalized since 1998. Canada is one of the primary producers of oilseed hemp, and most of the Canadian hemp seed is exported to the U.S.

Hemp oil

There are three different oils from industrial hemp: cannabidiol (CBD) oil, essential oil, and seed fixed (fatty) oil. Cannabidiol oil is legal in many states and is being included in a wide variety of products, from sparkling water to lotion. However, CBD’s purported health benefits have not yet been verified by scientific research. Unlike the other major cannabinoid compound — tetrahydrocannabinol (THC) — CBD is classed as nonintoxicating and without “abuse liability,” which means it is not addictive.

Cannabidiol is known for a wide range of pharmacological activities, although there is still a need for research to clarify the exact mechanism of CBD action and its safety profile. A pharmaceutical-grade CBD extract was approved in 2018 by the FDA as a new medicine for the treatment of two rare forms of epilepsy in children. Another cannabis-based pharmaceutical that contains 1:1 THC and CBD has been on the market since 2010.

Hemp fibers

There are three different fiber cells in hemp stems: primary phloem, secondary phloem and xylem. The primary phloem includes the outer cells that provide long fibers. The inner cells generated by the cambium provide secondary phloem short fibers, and inside the cambium is the wood (hurds), which provides short fibers. The longer the fibers, the more valuable they are.

Primary bast fibers are the most commercially valuable of the hemp fibers, followed by the secondary bast fibers and then the wood core fibers. The fiber hemp plant height, stem diameter and other morphological features depend on the genotype (variety) and environment. Agronomic conditions (plant density, irrigation, fertilization, harvest time, etc.) play a critical role in plant morphology and fiber yield and quality.

References

Pisanti, Simona, Anna Maria Malfitano, Elena Ciaglia, Anna Lamberti, Roberta Ranieri, Gaia Cuomo, Mario Abate et al. “Cannabidiol: State of the art and new challenges for therapeutic applications.” Pharmacology & Therapeutics 175 (2017): 133-150.

Russo, Ethan B. “Cannabidiol claims and misconceptions.” Trends in Pharmacological Sciences 38, no. 3 (2017): 198-201.

Frequently asked questions

Question: What are the differences between hemp essential oil and hemp seed (fixed, vegetable) oil?

Answer: They are very different products.

Essential oils (aka volatile oils) are generally volatile organic substances produced by many types of plants that readily evaporate when exposed to air. They have a distinct, strong aroma that resembles the aroma of the plant from which it was extracted. Hemp essential oil is a complex natural product mix comprising around 140 individual constituents, including terpenes. The strong odors associated with hemp are primarily due to the terpenes; the cannabinoids such as THC and CBD have very little smell. Hemp essential oil and cannabinoids accumulate in the glandular trichomes, the epidermal hair-like structures on leaves and female flowers.

The hemp seed (fixed) oil does not contain cannabinoids or terpenes. It contains fatty acids like other edible vegetable oils. The composition of hemp seed oil is comparable to other edible oils. It has a high concentration of polyunsaturated fatty acids, which is considered good for human health. However, the high concentration of polyunsaturated fatty acids makes it sensitive to oxidation rancidity. The degradation of hemp seed oil is accelerated by light, heat or bacteria, making hemp seed oil excellent table oil for salad dressing but unsuitable for frying or baking.

Q: What is hemp oil? What is the oil content in hemp?

A: Industrial hemp contains fatty acid oil found in seeds and volatile oil found in flowers and leaves. The fatty acid oil content of seeds is about 30%.

Q: Does hemp include male and female plants?

A: Yes. Industrial hemp (and hemp in general) is dominantly dioecious, with male and female reproductive structures on separate plants (Figure 2, page 3). Male plants flower and die earlier and do not provide grain (seed) or sufficient fiber, the two commercial products. Breeding and selection efforts in other countries since the 1930s resulted in monoecious varieties (with male and female reproductive structures on the same plant) and even varieties with most or all plants being female.

Q: What is the fiber content of industrial hemp varieties?

A: Tests show fiber content ranges from 25% to 38% of dry biomass, although other reports have shown fiber content ranging from below 20% to 50%.

Q: What is the fiber yield of industrial hemp?

A: Reports from Europe say dry bast fiber yields vary from 1,070 to 2,680 pounds per acre (1,200 to 3,000 kg/ha), while the cellulose yield is usually from 6,250 to 8,920 pounds per acre (7,000 to 10,000 kg/ha).

Q: What are the estimated grain yields?

A: Grain yields can vary depending on the variety, cropping system and desired end product. Grain yields may range from 360 to 1,785 pounds per acre (400 to 2,000 kg/ha).

Q: What are the advantages of hemp fiber over other types of fibers?

A: Hemp fibers are naturally biodegradable and have other advantages over synthetic fibers, which are mostly fossil fuel-based.

Q: Are there differences between fiber and oilseed hemp?

A: Both are considered industrial hemp, but the cultural methods differ. Also, there are varieties selected for fiber production and others for grain production, although some of the varieties can be grown for both fiber and grain (dual-purpose varieties).

Q: Do industrial hemp varieties contain psychoactive/intoxicating constituents?

A: Yes, but at low concentrations (below 1%). The primary psychoactive compounds in hemp are tetrahydrocannabinols, or THC. Under the 2018 Farm Bill, industrial hemp must contain less than 0.3% delta-9 THC — too little to produce intoxicating effects.

Q: Is it true that hemp is used in the automobile industry?

A: Yes. Henry Ford used hemp products as body components (resin enforced with hemp and flax fibers) in one of the original cars in the 1940s. Recent news reports stated that some auto manufacturers use more than 30 different parts made of natural fibers, including hemp.

Regulations/government support

Q: Can I grow an industrial hemp crop legally in Oregon?

A: Yes, if it is grown and sold in compliance with the 2014 and 2018 federal farm bills. In Oregon, you also need a license from Oregon’s state agriculture department.

When growing hemp commercially, it is advisable to source for certified seed. Oregon State University started certifying hemp seeds in June 2019.

Q: Is it legal to grow and sell hemp?

A: Yes, if it is grown and sold in compliance with the 2014 and 2018 federal farm bills. In Oregon, you also need a license from the state agriculture department. For details, see the department’s website (https://oda.direct/hemp).

Q: Does the new federal Farm Bill address the issue with FDIC insurance? Are banks now willing to work with hemp growers?

A: Due to the shifting legal climate, some banks are now willing to work with industrial hemp growers. Check with your bank to find out what is available.

Q: Does current law prohibit fiber and oilseed hemp with a high concentration of THC content?

A: Yes. Countries regulate how much THC can be in fiber and oilseed hemp varieties. The U.S. limit for THC is 0.3% in dried biomass. If above that, the variety of Cannabis sativa is considered marijuana.

Q: Are there any programs or funding available for new farmers involved in hemp production, seed production or pilot research programs for hemp?

A: Oregon State University and the state Department of Agriculture are not aware of any such programs at this time.

Q: What are the land-use regulations regarding growing hemp or establishing hemp-processing facilities?

A: Hemp is an agricultural crop that has been decriminalized at the federal and state levels. As such, you may be able to grow hemp on any property that is zoned for agricultural production. If you have any questions about whether agricultural production is allowed on your property, contact your local planning department. Processing will vary from municipality to municipality. As part of your application to the state of Oregon, you will need to take a Land Use Compatibility form to your local planning department for approval. The land-use form is part of the handler application available on the state’s hemp webpage at https://oda.direct/hemp.

Genetics

Q: Are there good cultivars for dual-purpose crops that provide high-protein forage and quality fiber?

A: Yes. Some varieties can be used as a dual purpose for grain and fiber production, but hemp is not an approved animal feed in the U.S.

Q: Will OSU certify hemp seed as with other crops?

A: Yes. OSU started certifying hemp seed in June 2019.

Q: What are good sources of hemp seed? Are there public hemp varieties?

A: Due to the rigor that goes into seed certification, OSU cannot, at the moment, ascertain any good sources of seed or public varieties.

Agronomics

Q: What are the soils, fertilizers and irrigation needed for hemp production?

A: Industrial hemp can be grown successfully on a variety of soils, but it grows best in well-drained, fertile soil. Hemp does not tolerate very wet soils. Production issues caused by growth in wet soils can include low fiber quality and uneven plant heights, which present challenges at harvest. Generally, hemp requires more water than most field crops.

Q: What are good cover or rotation crops to grow before or after hemp?

A: Industrial hemp fits well in rotations with wheat, barley, corn, alfalfa, potatoes and soybeans.

Q: What nutrients and pH levels are required for hemp?

A: Hemp nutrient requirements are similar to those of spring wheat. While hemp nutrient requirements for a given soil and region may not be available, nutrient requirements for wheat are. We suggest you test the soil and follow nutrient guidelines for spring wheat.

Pests

Q: How do you control grasshoppers and russet mites in hemp?

A: See information on the state guide list (https://oda.direct/CannabisPesticides) on what pesticides are not illegal for use on cannabis (includes both hemp and marijuana). Here is a link to the cannabis and pesticides handout: https://www.oregon.gov/ODA/shared/Documents/Publications/PesticidesPARC/CannabisPesticides.pdf.

Contamination

Q: If the soil contains chemical residues from pesticide applications made years ago (DDT/DDE, Paraquat, lead, arsenic, etc.) will it damage the hemp crop or make it unsaleable? Are there safe soil thresholds?

A: In general, some chemicals in the soil can be taken up and accumulated by plants, but others are not. Little is known about hemp’s specific ability to uptake various chemicals. For chemical use in current crop management, see information referring to the state guide list (https://oda.direct/CannabisPesticides) on what pesticides are legal to use on cannabis (includes both hemp and marijuana). Growers should not use any pesticides that are not approved for hemp by the state.

Organizations

Q: Are there any hemp grower or industry groups forming?

A: A hemp commodity commission may be formed if state legislation calling for it is adopted. Meanwhile, efforts are underway to create a hemp grower association.

Q: I’d like to rent my field to a hemp grower. Whom should I contact?

A: A list of registered hemp growers in Oregon is at [email protected]

Q: Where can I sell the hemp crop I grow?

A: If you are looking for a list of registered hemp handlers, you can contact the state at [email protected] for that list.

Q: Can hemp be fed to livestock? How good a feed is it?

A: While some countries allow hemp to be fed to animals, it is not legal to do so in the U.S. However, it is legal in Oregon to have hemp byproducts in cat and dog food as long as the product is registered as a veterinary remedy. See https://www.oregon.gov/ODA/programs/AnimalHealthFeedsLivestockID/AHLicensing/Pages/VeterinaryProductRegistration.aspx for more information.

Further information

  • United States Department of Agriculture, National Institute of Food and Agriculture, https://nifa.usda.gov/industrial-hemp
  • Oregon Department of Agriculture. Industrial Hemp. https://www.oregon.gov/oda/programs/nurserychristmastree/pages/hemp.aspx
  • Oregon Department of Agriculture. 2019. Industrial hemp grower/seed registration application: https://www.oregon.gov/ODA/shared/Documents/Publications/NurseryChristmasTree/Grower-SeedHandlerRegistration.pdf
  • Oregon Department of Agriculture, https://apps.oregon.gov/SOS/LicenseDirectory/LicenseDetail/1443
  • Washington State Department of Agriculture. Industrial hemp research pilot, https://agr.wa.gov/inspection/hemp/default.aspx
  • Ontario Ministry of Agriculture, Food and Rural Affairs: Growing Industrial Hemp in Ontario. http://www.omafra.gov.on.ca/english/crops/facts/00-067.htm
  • North Carolina Department of Agriculture and Consumer Services: Industrial Hemp Pilot Program in NC. https://www.ncagr.gov/hemp/
  • Kentucky Department of Agriculture. http://www.kyagr.com/marketing/hemp-pilot.html
  • Colorado Department of Agriculture. Industrial hemp. https://www.colorado.gov/pacific/agplants/industrial-hemp
  • Government of Canada. Producing and selling hemp: https://www.canada.ca/en/health-canada/services/drugs-medication/cannabis/producing-selling-hemp.html
  • Alberta, Agriculture and Forestry. Industrial Hemp Enterprise: http://www1.agric.gov.ab.ca/$Department/deptdocs.nsf/all/agdex126
  • Industrial Hemp: From seed to market. Cornell University Extension. http://ccetompkins.org/resources/industrial-hemp-from-seed-to-market

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