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Black Seed Oil Side Effects & Safety

Evidence:Moderate
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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

  • GI discomfort (nausea, bloating, burning sensation) especially at higher doses
  • Contact dermatitis in sensitive individuals (topical use)
  • Strong taste and odor of the oil (mitigated by capsule form)
  • May lower blood pressure — monitor if already on antihypertensives

Drug & Supplement Interactions

  • Antidiabetic medications — black seed oil may enhance blood sugar lowering; monitor glucose closely
  • Anticoagulants — thymoquinone has mild antiplatelet activity; use caution with warfarin
  • Antihypertensives — additive blood pressure lowering possible
  • Immunosuppressants — black seed oil has immune-modulating properties; discuss with transplant team

Maximum Dose

Do not exceed: Up to 3g/day oil has been used safely in clinical trials; avoid exceeding 5g/day

Full Black Seed Oil Guide

References

  1. Meta-analysisMousavi SM, Sheikhi A, Varkaneh HK, et al. (2018). Effect of Nigella sativa supplementation on obesity indices: a systematic review and meta-analysis of randomized controlled trials. Complementary Therapies in Medicine. DOI PubMed
  2. Meta-analysisDaryabeygi-Khotbehsara R, Golzarand M, Ghaffari MP, Djafarian K (2017). Nigella sativa improves glucose homeostasis and serum lipids in type 2 diabetes: a systematic review and meta-analysis. Complementary Therapies in Medicine. DOI PubMed
  3. ReviewAhmad A, Husain A, Mujeeb M, et al. (2013). A review on therapeutic potential of Nigella sativa: a miracle herb. Asian Pacific Journal of Tropical Biomedicine. DOI PubMed
  4. RCTFerro Y, Pujia R, Mazza E, Lascala L, et al. (2022). A new nutraceutical (Livogen Plus®) improves liver steatosis in adults with non-alcoholic fatty liver disease.. Journal of translational medicine. DOI PubMed
  5. Furulund E, Bemanian M, Berggren N, Madebo T, et al. (2021). Effects of Nutritional Interventions in Individuals with Chronic Obstructive Lung Disease: A Systematic Review of Randomized Controlled Trials.. International journal of chronic obstructive pulmonary disease. DOI PubMed
  6. RCTAl-Azzawi MA, AboZaid MMN, Ibrahem RAL, Sakr MA (2020). Therapeutic effects of black seed oil supplementation on chronic obstructive pulmonary disease patients: A randomized controlled double blind clinical trial.. Heliyon. DOI PubMed