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Cordyceps 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

  • Generally well-tolerated with few reported side effects
  • Mild digestive discomfort (rare)
  • Dry mouth reported occasionally
  • Theoretical risk of overstimulation of the immune system in autoimmune conditions

Drug & Supplement Interactions

  • May enhance effects of anticoagulant/antiplatelet medications (cordycepin has mild anti-platelet activity)
  • May interact with immunosuppressant medications
  • May lower blood sugar — monitor with diabetes medications
  • May interact with cyclophosphamide and other chemotherapy agents

Maximum Dose

Do not exceed: 4g/day (higher doses used in some studies without adverse effects)

Full Cordyceps Guide

References

  1. RCTHirsch KR, Smith-Ryan AE, Roelofs EJ, et al. (2017). Cordyceps militaris Improves Tolerance to High-Intensity Exercise After Acute and Chronic Supplementation. Journal of Dietary Supplements. DOI PubMed
  2. Tuli HS, Sandhu SS, Sharma AK (2014). Pharmacological and therapeutic potential of Cordyceps with special reference to Cordycepin. 3 Biotech. DOI PubMed
  3. Meta-analysisWang C, Wang J, Qi Y (2024). Adjuvant treatment with Cordyceps sinensis for lung cancer: A systematic review and meta-analysis of randomized controlled trials.. Journal of ethnopharmacology. DOI PubMed
  4. Meta-analysisBee Yean O, Zoriah A (2019). Efficacy of Cordyceps sinensis as an adjunctive treatment in hemodialysis patients: a systematic review and Meta-analysis.. Journal of traditional Chinese medicine = Chung i tsa chih ying wen pan. PubMed
  5. Ong BY, Aziz Z (2017). Efficacy of Cordyceps sinensis as an adjunctive treatment in kidney transplant patients: A systematic-review and meta-analysis.. Complementary therapies in medicine. DOI PubMed
  6. Zhang HW, Lin ZX, Tung YS, Kwan TH, et al. (2014). Cordyceps sinensis (a traditional Chinese medicine) for treating chronic kidney disease.. The Cochrane database of systematic reviews. DOI PubMed
  7. Yao L, Zhu L, Chen C, Wang X, et al. (2024). A systematic review on polysaccharides from fermented Cordyceps sinensis: Advances in the preparation, structural characterization, bioactivities, structure-activity relationships.. International journal of biological macromolecules. DOI PubMed
Show 3 more references
  1. Wu F, Xu C, Si X, He F, et al. (2024). Efficacy of traditional Chinese medicine Cordyceps sinensis as an adjunctive treatment in patients with renal dysfunction: a systematic-review and meta-analysis.. Frontiers in medicine. DOI PubMed
  2. ReviewJędrejko M, Jędrejko K, Granda D, Kała K, et al. (2026). Current Evidence of Ergogenic and Post-Exercise Recovery Effects of Dietary Supplementation with Cordyceps militaris in Humans-A Narrative Review.. Nutrients. DOI PubMed
  3. RCTZhao S, Wang Z, Fan X, Shu X, et al. (2025). Effectiveness of fermentation broth of Cordyceps sinensis for primary insomnia: a randomized clinical trial with digital health tool.. Frontiers in neurology. DOI PubMed