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Lion's Mane 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

  • Rare — mild gastrointestinal discomfort during initial use
  • Skin itching in sensitive individuals (likely related to NGF stimulation)
  • Possible allergic reaction in those with mushroom sensitivities

Drug & Supplement Interactions

  • Anticoagulant medications — lion's mane may have mild antiplatelet effects
  • Antidiabetic medications — may lower blood sugar levels additively

Maximum Dose

Do not exceed: 3000mg/day from supplements (higher doses not well-studied)

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References

  1. RCTMori K, Inatomi S, Ouchi K, Azumi Y, Tuchida T (2009). Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial. Phytotherapy Research. DOI PubMed
  2. Lai PL, Naidu M, Sabaratnam V, et al. (2013). Neurotrophic properties of the Lion's mane medicinal mushroom, Hericium erinaceus. International Journal of Medicinal Mushrooms. DOI PubMed
  3. RCTSaitsu Y, Nishide A, Kikushima K, Shimizu K, Ohnuki K (2019). Improvement of cognitive functions by oral intake of Hericium erinaceus. Biomedical Research. DOI PubMed
  4. Surendran G, Saye J, Binti Mohd Jalil S, Spreadborough J, et al. (2025). Acute effects of a standardised extract of Hericium erinaceus (Lion's Mane mushroom) on cognition and mood in healthy younger adults: a double-blind randomised placebo-controlled study.. Frontiers in nutrition. DOI PubMed
  5. ReviewMenon A, Jalal A, Arshad Z, Nawaz FA, et al. (2025). Benefits, side effects, and uses of Hericium erinaceus as a supplement: a systematic review.. Frontiers in nutrition. DOI PubMed
  6. Shu MY, Zhang XC, Zuo L, Jiang FL, et al. (2025). Effects of fungal supplementation on endurance, immune function, and hematological profiles in adult athletes: a systematic review and meta-analysis.. Frontiers in nutrition. DOI PubMed
  7. RCTDocherty S, Doughty FL, Smith EF (2023). The Acute and Chronic Effects of Lion's Mane Mushroom Supplementation on Cognitive Function, Stress and Mood in Young Adults: A Double-Blind, Parallel Groups, Pilot Study.. Nutrients. DOI PubMed
Show 1 more reference
  1. La Monica MB, Raub B, Ziegenfuss EJ, Hartshorn S, et al. (2023). Acute Effects of Naturally Occurring Guayusa Tea and Nordic Lion's Mane Extracts on Cognitive Performance.. Nutrients. DOI PubMed