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Hemp Seed Oil (Cannabis sativa)
Oil pressed from Cannabis sativa seeds, prized for a balanced ~3:1 omega-6:omega-3 ratio plus gamma-linolenic acid (GLA). It contains negligible cannabinoids — this is NOT CBD oil. Small human trials hint at skin and lipid-profile effects, but the overall evidence is thin.
What the evidence says
Most Hemp Seed Oil studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality randomised trials published 2005–2026 with a typical study size of 15 participants.
Based on 8 studies · 5 RCTs · 15 total participants
Confidence
Moderate confidenceBy outcome
Scores very low because human evidence is just two small crossover trials hinting at skin and fatty-acid effects, while a Cochrane review found no convincing benefit of supplements (including hempseed oil) for eczema.
5 trials ongoing or recruiting · 15 completed on ClinicalTrials.gov
Registered trials show research momentum for Hemp Seed Oil, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Sep 2026
Hemp seed oil is cold-pressed from the seeds of Cannabis sativa (industrial hemp). Its appeal is its fatty-acid composition: a roughly 3:1 ratio of omega-6 (linoleic acid) to omega-3 (alpha-linolenic acid), considered favorable, plus gamma-linolenic acid (GLA), an omega-6 with anti-inflammatory signaling.
Crucially, hemp SEED oil is a culinary/nutritional oil with only trace cannabinoids — it is not CBD oil and is not psychoactive.
Human evidence is limited and comes from small studies: a 20-week single-blind crossover suggested dietary hemp seed oil improved atopic dermatitis symptoms and skin dryness, and a small crossover showed it shifts the serum fatty-acid profile (raising GLA) with only minor effects on total cholesterol.
A Cochrane review of dietary supplements for eczema — which included a hempseed oil trial — found no convincing benefit across supplements as a class. Treat it as a healthy cooking oil with plausible but unproven targeted benefits, not a validated therapeutic.
Supplies linoleic acid (omega-6) and alpha-linolenic acid (omega-3) in a roughly 3:1 ratio, a composition often considered favorable for fatty-acid balance.
Contains GLA, an omega-6 fatty acid that feeds into anti-inflammatory eicosanoid pathways and supports skin-barrier lipids.
How Hemp Seed Oil works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Quality hemp seed oil has negligible THC; reputable products are very unlikely to cause a positive test, but choose tested brands if this is a concern.
Hemp seed oil as a food is generally regarded as low-risk, but dedicated safety data are limited — use culinary amounts and consult a clinician.
Omega-3/omega-6 polyunsaturated fats have mild antiplatelet activity; a modest additive effect with blood thinners is possible at high intakes.
Tip: Start with a smaller amount; take with food
The current evidence for Hemp Seed Oil is insufficient to assign an evidence score, based on 7 indexed studies. Oil pressed from Cannabis sativa seeds, prized for a balanced ~3:1 omega-6:omega-3 ratio plus gamma-linolenic acid (GLA). It contains negligible cannabinoids — this is NOT CBD oil. Small human trials hint at skin and lipid-profile effects, but the overall evidence is thin. Representative study: PMID 22336810.
The commonly studied dose of Hemp Seed Oil is Commonly ~15-30ml (1-2 tablespoons) daily as a dietary oil; trial doses ran up to 30ml/day. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Hemp Seed Oil is with meals. Take it with food. As a dietary fat, it is best taken with food; do not use for high-heat cooking as PUFAs are heat-sensitive.
Hemp Seed Oil is generally well-tolerated and considered safe for most healthy adults at recommended doses. Reported side effects are uncommon and include mild digestive upset / loose stools. Use caution if any of these apply to you: Allergy to hemp/cannabis seeds.
Omega-3
Probably helpsEssential fatty acids critical for brain health, mood regulation, and reducing inflammation throughout the body.
Flaxseed
Mostly mechanism / observationalA whole food rich in the plant omega-3 ALA, soluble fiber, and lignans. The best-supported benefit is a modest blood-pressure reduction with whole/milled flaxseed (meta-analysis level), with smaller effects on LDL cholesterol and glycemic markers. Menopausal-symptom and lignan effects are weak and inconsistent.
Krill Oil
Mostly mechanism / observationalA marine omega-3 source where the EPA/DHA is bound to phospholipids (rather than triglycerides as in fish oil) and packaged with the antioxidant astaxanthin. RCT meta-analyses show modest reductions in LDL and triglycerides, and two solid knee-osteoarthritis trials show modest pain/function improvement. Bioavailability advantages over fish oil are real but small.
Algae Oil
Mostly mechanism / observationalA vegan, fish-free source of the long-chain omega-3 fatty acids DHA (and increasingly EPA) extracted from marine microalgae. Randomized human trials show algal DHA is bioequivalent to fish-oil and cooked-salmon DHA for raising blood omega-3 levels, making it a legitimate plant-based alternative to fish oil.
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 8 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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