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Huperzine A 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: Safe with Caution

Potential Side Effects

  • Nausea and digestive upset (most common, dose-dependent)
  • Diarrhea
  • Sweating and increased salivation (cholinergic effects)
  • Muscle twitching or cramps
  • Vivid dreams or insomnia
  • Bradycardia at higher doses

Drug & Supplement Interactions

  • Cholinesterase inhibitors (donepezil, rivastigmine, galantamine) — dangerous additive effects, do not combine
  • Anticholinergic medications — Huperzine A will counteract their effects
  • Beta-blockers — additive bradycardia risk
  • Anesthesia — stop 2 weeks before surgery due to cholinergic effects

Maximum Dose

Do not exceed: 400mcg/day (note: this is micrograms, not milligrams)

Full Huperzine A Guide

References

  1. RCTXu SS, Gao ZX, Weng Z, et al. (1999). Efficacy of tablet huperzine-A on memory, cognition, and behavior in Alzheimer's disease. Acta Pharmacologica Sinica. PubMed
  2. Meta-analysisYang G, Wang Y, Tian J, Liu JP (2013). Huperzine A for Alzheimer's disease: a systematic review and meta-analysis of randomized clinical trials. PLoS ONE. DOI PubMed
  3. RCTSun QQ, Xu SS, Pan JL, et al. (1999). Huperzine-A capsules enhance memory and learning performance in 34 pairs of matched adolescent students. Acta Pharmacologica Sinica. PubMed
  4. Meta-analysisHuang P, Li B, Guo YH, Feng S, et al. (2019). [Efficacy and safety of huperzine A in treating patients with mild cognitive impairment: a systematic review and Meta-analysis].. Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica. DOI PubMed
  5. Meta-analysisZheng W, Xiang YQ, Li XB, Ungvari GS, et al. (2016). Adjunctive huperzine A for cognitive deficits in schizophrenia: a systematic review and meta-analysis.. Human psychopharmacology. DOI PubMed
  6. Meta-analysisWang BS, Wang H, Wei ZH, Song YY, et al. (2009). Efficacy and safety of natural acetylcholinesterase inhibitor huperzine A in the treatment of Alzheimer's disease: an updated meta-analysis.. Journal of neural transmission (Vienna, Austria : 1996). DOI PubMed
  7. Li J, Wu HM, Zhou RL, Liu GJ, et al. (2008). Huperzine A for Alzheimer's disease.. The Cochrane database of systematic reviews. DOI PubMed
Show 3 more references
  1. Yue J, Dong BR, Lin X, Yang M, et al. (2012). Huperzine A for mild cognitive impairment.. The Cochrane database of systematic reviews. DOI PubMed
  2. Hao Z, Liu M, Liu Z, Lv D (2009). Huperzine A for vascular dementia.. The Cochrane database of systematic reviews. DOI PubMed
  3. Wessinger CM, Inman CL, Weinstock J, Weiss EP (2021). Effect of Huperzine A on Cognitive Function and Perception of Effort during Exercise: A Randomized Double-Blind Crossover Trial.. International journal of exercise science. DOI PubMed