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Astaxanthin Side Effects & Safety

Evidence:Moderate
·

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 very well-tolerated
  • Mild orange-red discoloration of stool (harmless)
  • Slight skin pigmentation change at very high doses (reversible)
  • Rare mild gastrointestinal discomfort

Drug & Supplement Interactions

  • May have additive effects with blood pressure-lowering medications
  • Theoretical interaction with 5-alpha reductase inhibitors (astaxanthin may inhibit this enzyme)
  • May enhance the effects of other antioxidant supplements

Maximum Dose

Do not exceed: Up to 24 mg/day has been used safely in short-term studies; 12 mg/day is well-established

Full Astaxanthin Guide

References

  1. RCTIto N, Seki S, Ueda F. (2018). The protective role of astaxanthin for UV-induced skin deterioration in healthy people. Nutrients. DOI PubMed
  2. ObservationalYamashita E. (2006). The effects of a dietary supplement containing astaxanthin on skin condition. Carotenoid Science.
  3. Babaei Hoolari B, Fatahi Dehpahni M, Amidi F (2026). Effects of astaxanthin supplementation on human sperm quality during the freeze thaw process: a systematic review and meta analysis.. Scientific reports. DOI PubMed
  4. Rodrigues VD, Boaro BL, Laurindo LF, Chagas EFB, et al. (2025). Exploring the benefits of astaxanthin as a functional food ingredient: Its effects on oxidative stress and reproductive outcomes in women with PCOS - A systematic review and single-arm meta-analysis of randomized clinical trials.. Naunyn-Schmiedeberg's archives of pharmacology. DOI PubMed
  5. Maleki-Hajiagha A, Shafie A, Maajani K, Amidi F (2024). Effect of astaxanthin supplementation on female fertility and reproductive outcomes: a systematic review and meta-analysis of clinical and animal studies.. Journal of ovarian research. DOI PubMed
  6. Meta-analysisLiu C, Dong X, Jia J, Ha M (2024). Effects of Astaxanthin Supplementation on Fatigue, Motor Function and Cognition: A Meta-Analysis of Randomized Controlled Trials.. Biological research for nursing. DOI PubMed
  7. Arefpour H, Rasaei N, Amini MR, Salavatizadeh M, et al. (2024). The effects of astaxanthin supplementation on liver enzyme levels.. International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition. DOI PubMed
Show 3 more references
  1. Meta-analysisMa B, Lu J, Kang T, Zhu M, et al. (2022). Astaxanthin supplementation mildly reduced oxidative stress and inflammation biomarkers: a systematic review and meta-analysis of randomized controlled trials.. Nutrition research (New York, N.Y.). DOI PubMed
  2. Leung LY, Chan SM, Tam HL, Wong ES (2022). Astaxanthin Influence on Health Outcomes of Adults at Risk of Metabolic Syndrome: A Systematic Review and Meta-Analysis.. Nutrients. DOI PubMed
  3. Meta-analysisZhou X, Cao Q, Orfila C, Zhao J, et al. (2021). Systematic Review and Meta-Analysis on the Effects of Astaxanthin on Human Skin Ageing.. Nutrients. DOI PubMed