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Hemp Seed Oil Side Effects & Safety

Evidence:Emerging
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Safety Profile

Overall safety rating: Generally Safe

Potential Side Effects

  • Mild GI discomfort (loose stools, bloating) — most common at higher doses; usually resolves with dose reduction
  • Nausea — uncommon, typically when taken on an empty stomach
  • Mild anticoagulant effect at high doses — due to omega-3 content; clinically insignificant at standard doses
  • Allergic reactions — rare; hemp seed allergies exist but are uncommon
  • Potential false positive on THC drug tests — extremely rare with reputable brands that test for THC, but trace contamination is theoretically possible from manufacturing

Drug & Supplement Interactions

  • Anticoagulants and antiplatelets (warfarin, aspirin) — omega-3 content may mildly increase bleeding risk at high doses
  • Anticonvulsants — theoretical interaction via fatty acid metabolism; no clinical reports but monitor when combining
  • Immunosuppressants — GLA modulates immune function; could theoretically alter immunosuppressive drug efficacy
  • Other GLA supplements (evening primrose oil, borage oil) — additive GLA intake; calculate total GLA from all sources

Maximum Dose

Do not exceed: 4 tablespoons/day (60 mL); higher doses may cause loose stools without additional benefit

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References

  1. RCTCallaway J, Schwab U, Harvima I, Halonen P, Mykkanen O, Hyvonen P, Jarvinen T (2005). Efficacy of dietary hempseed oil in patients with atopic dermatitis. Journal of Dermatological Treatment. DOI PubMed
  2. ReviewDeferne JL, Pate DW (1996). Hemp seed oil: A source of valuable essential fatty acids. Journal of the International Hemp Association.
  3. RCTPutthong C, Panmanee T, Charoensit P, Ross S, et al. (2024). Efficacy of Natural β-Carotene Chewable Tablets Derived from Banana (Musa AA) Pulp in Reducing UV-Induced Skin Erythema.. Nutrients. DOI PubMed
  4. ObservationalFarì G, Megna M, Scacco S, Ranieri M, et al. (2023). Hemp Seed Oil in Association with β-Caryophyllene, Myrcene and Ginger Extract as a Nutraceutical Integration in Knee Osteoarthritis: A Double-Blind Prospective Case-Control Study.. Medicina (Kaunas, Lithuania). DOI PubMed
  5. RCTRezapour-Firouzi S, Arefhosseini SR, Mehdi F, Mehrangiz EM, et al. (2013). Immunomodulatory and therapeutic effects of Hot-nature diet and co-supplemented hemp seed, evening primrose oils intervention in multiple sclerosis patients.. Complementary therapies in medicine. DOI PubMed