Short answer: Hempseed oil is the cold-pressed seed oil from Cannabis sativa L. (industrial hemp cultivar bred for low THC content under 0.3 percent), distinct from CBD and THC cannabinoid extracts which derive from the flower and leaf tissue rather than the seeds. Per Callaway 2004 (Euphytica) hempseed composition review and Leizer 2000 (J Nutraceuticals Funct Med Foods), the oil contains approximately 15–20 percent alpha-linolenic acid (ALA, 18:3 omega-3), 50–60 percent linoleic acid (LA, 18:2 omega-6), 3–5 percent gamma-linolenic acid (GLA, 18:3 omega-6), 10–15 percent oleic acid, and 5–7 percent saturated fatty acids. The omega-3:omega-6 ratio is approximately 1:3 per Simopoulos 2002 (Biomed Pharmacother) omega ratio review — unusually balanced for a plant oil. The GLA content is the distinctive feature: GLA bypasses the rate-limiting delta-6 desaturase step in the LA-to-arachidonic-acid pathway and may modulate inflammatory eicosanoid balance per Kapoor 2006 (Prog Lipid Res) GLA review. The hempseed regulatory framework is distinct from cannabinoid (CBD, THC) regulation: per AAFCO 2024 Official Publication, hempseed and hempseed oil have limited but emerging ingredient definitions following 2018 US Farm Bill industrial-hemp legalization. CBD and THC cannabinoids in pet food are not approved by FDA-CVM per 2024 guidance. The KibbleIQ rubric treats hempseed oil as a positive plant omega signal with a regulatory novelty caveat: pet food labeled with "hempseed oil" should not contain CBD or THC.

Source crop and seed-versus-cannabinoid distinction

Per Small 2015 (Bot Rev) Cannabis taxonomy review and Andre 2016 (Front Plant Sci) Cannabis chemistry review, Cannabis sativa L. comprises a single botanical species with cultivars selected over centuries for either fiber + seed production (industrial hemp, low cannabinoid content) or psychoactive flower production (marijuana, high tetrahydrocannabinol content). The 2018 US Farm Bill federally legalized industrial hemp cultivation and processing under the definition of cultivars containing less than 0.3 percent dry-weight delta-9-tetrahydrocannabinol (THC). Hempseeds and hempseed oil derive from the seed tissue, which is essentially cannabinoid-free even in high-THC marijuana cultivars per Leizer 2000 work.

The cold-pressed oil extraction process mechanically expresses oil from cleaned, dehulled hempseeds without solvent. Per Crescente 2018 (Toxicol Rep) hemp regulatory review and FDA-CVM 2024 cannabinoid pet product guidance, the seed-derived oil contains essentially no CBD or THC. Pet food ingredients labeled "hempseed oil" or "hemp oil" should not contain cannabinoid extracts; products marketed as containing CBD as a functional ingredient enter a separate FDA-CVM regulatory framework that as of 2024 has not approved CBD or THC for pet food use. The cannabinoid distinction overlaps the broader functional-supplement-controversy framework in our content; CBD pet products are not yet covered by a dedicated KibbleIQ rubric or explainer.

Fatty acid profile and balanced omega ratio

Per Callaway 2004 (Euphytica) hempseed composition review and Leizer 2000 (J Nutraceuticals Funct Med Foods), the hempseed oil fatty acid profile breaks down approximately as: linoleic acid (LA, 18:2 omega-6) at 50–60 percent, alpha-linolenic acid (ALA, 18:3 omega-3) at 15–20 percent, gamma-linolenic acid (GLA, 18:3 omega-6) at 3–5 percent, oleic acid (18:1 omega-9) at 10–15 percent, palmitic acid (16:0) at 5–7 percent, and stearic acid (18:0) at 2–3 percent. The omega-3:omega-6 ratio is approximately 1:3, substantially more balanced than most plant seed oils.

Per Simopoulos 2002 (Biomed Pharmacother) omega ratio review and AAHA 2014 (Weight Management Guidelines) inflammatory framework, omega-3:omega-6 ratios closer to 1:1 to 1:5 are positioned as anti-inflammatory in mammalian metabolism, while ratios approaching 1:20 (typical Western diets dominated by corn, soy, sunflower oils) are positioned as pro-inflammatory through arachidonic acid pathway flux. Hempseed oil’s 1:3 ratio is in the favorable range, distinct from canola oil (~1:2 ratio, also favorable), flaxseed oil (~4:1 ratio, very omega-3-dominant), and sunflower oil (~1:200 ratio, very omega-6-dominant). The omega ratio framework overlaps with our omega-3 fatty acids explainer, flaxseed oil explainer, and canola oil explainer.

Gamma-linolenic acid (GLA) bypass pathway

Per Kapoor 2006 (Prog Lipid Res) GLA review and Horrobin 1992 (Lipids) essential fatty acid review, gamma-linolenic acid (GLA, 18:3 omega-6) is biosynthesized in mammalian metabolism from linoleic acid (LA, 18:2 omega-6) by the rate-limiting delta-6 desaturase enzyme. Delta-6 desaturase activity is reduced in some physiological states (aging, diabetes, atopic dermatitis, sepsis) and can become rate-limiting for downstream eicosanoid production. Dietary GLA bypasses delta-6 desaturase and is preferentially elongated to dihomo-gamma-linolenic acid (DGLA, 20:3 omega-6), which is the substrate for prostaglandin E1 (PGE1) and other anti-inflammatory eicosanoids.

Per Mueller 2016 (Vet Med Int) canine atopic dermatitis review and Olivry 2010 (Vet Dermatol) ICADA dermatitis guidelines, evening primrose oil and borage oil (the two highest-GLA plant oils, at 9 percent and 22 percent GLA respectively) have been studied as adjunct therapy for canine atopic dermatitis with modest evidence of improvement in coat condition and pruritus. Hempseed oil at 3–5 percent GLA contains substantially less GLA than these dedicated GLA sources but contributes incrementally when used as a multipurpose seed oil. The skin-coat support framework overlaps with our best dog food for skin and coat guide and best dog food for allergies guide.

Industrial hemp regulatory framework

Per AAFCO 2024 Official Publication and Crescente 2018 (Toxicol Rep) hemp regulatory review, hempseed and hempseed oil entered the AAFCO ingredient definition framework following the 2018 US Farm Bill industrial-hemp legalization, but the framework remains limited compared to long-established plant oils (canola, sunflower, corn). Pet food ingredient definitions for hempseed oil and hempseed cake are present in the AAFCO 2024 Official Publication but with state-level regulatory variation: as of 2024, only some US states permit hempseed oil in commercial pet food, while others maintain prohibitions or pending review status.

Per FDA-CVM 2024 cannabinoid pet product guidance and Andre 2016 (Front Plant Sci), CBD and THC cannabinoid extracts in pet food are not approved by FDA-CVM as of 2024. Pet products marketed as containing CBD as a functional ingredient operate in a regulatory gray area without FDA-CVM safety or efficacy review. Pet owners should distinguish between hempseed oil (seed-derived, essentially cannabinoid-free, AAFCO-listed) and CBD oil (flower or leaf-derived, cannabinoid-containing, not FDA-approved). Veterinary consultation is appropriate before introducing any cannabinoid-containing product. The regulatory novelty framework distinguishes hempseed oil from longer-established plant oils with deeper safety records.

How KibbleIQ scores hempseed oil

The KibbleIQ Dry Kibble Rubric treats hempseed oil as a positive plant omega signal with regulatory novelty caveat. Hempseed oil in the first 8 ingredients receives a positive rubric signal indicating an intentional polyunsaturated fat strategy with the favorable 1:3 omega-3:omega-6 ratio plus modest GLA contribution. The rubric does not treat hempseed oil as a substitute for marine fish oil EPA + DHA contribution. Pet food ingredient labels referencing "hemp" should clearly distinguish "hempseed oil" or "hemp oil" (seed-derived, AAFCO-listed) from "CBD oil" or "hemp extract" (cannabinoid-containing, not FDA-approved for pet food). Formulations citing CBD or THC cannabinoid extracts as functional ingredients receive a separate caveat in the rubric.

To check whether your dog’s food contains hempseed oil or peer plant omega-3 sources, paste the ingredient list into the KibbleIQ analyzer. For peer plant oil context, see our flaxseed oil explainer, perilla oil explainer, chia oil explainer, canola oil explainer, and camelina oil explainer. For marine omega-3 context, see our salmon oil explainer and omega-3 fatty acids explainer. For methodology context, see our published methodology.