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Alpha-Lipoic Acid 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 symptoms (nausea, stomach upset) — the most common side effect, especially at higher doses
  • Hypoglycemia risk when combined with diabetes medications
  • Skin rash in rare cases
  • May produce a sulfurous body odor at high doses
  • Can mobilize stored heavy metals — use cautiously if mercury amalgam fillings are present

Drug & Supplement Interactions

  • Diabetes medications (insulin, metformin, sulfonylureas) — additive blood sugar lowering; monitor glucose closely
  • Thyroid medications (levothyroxine) — ALA may lower thyroid hormone levels; separate dosing by 4+ hours
  • Chemotherapy — ALA is a potent antioxidant that could theoretically reduce efficacy of oxidative chemotherapy; consult oncologist
  • Heavy metal chelation therapies — ALA has chelation properties; coordinate with practitioners

Maximum Dose

Do not exceed: 1200mg/day (doses used in clinical trials; higher doses may cause GI issues)

Full Alpha-Lipoic Acid Guide

References

  1. RCTZiegler D, Ametov A, Barinov A, et al. (2006). Oral treatment with alpha-lipoic acid improves symptomatic diabetic polyneuropathy: the SYDNEY 2 trial. Diabetes Care. DOI PubMed
  2. RCTAnsar H, Mazloom Z, Kazemi F, Hejazi N (2011). Effect of alpha-lipoic acid on blood glucose, insulin resistance and glutathione peroxidase of type 2 diabetic patients. Saudi Medical Journal. PubMed
  3. ReviewShay KP, Moreau RF, Smith EJ, Smith AR, Hagen TM (2009). Alpha-lipoic acid as a dietary supplement: molecular mechanisms and therapeutic potential. Biochimica et Biophysica Acta. DOI PubMed
  4. Meta-analysisPires IZ, Gobbo MODS, Sudo RYU, Milbradt TL, et al. (2025). Efficacy of Alpha Lipoic Acid Supplementation in Sperm Parameters: A Systematic Review and Meta-Analysis of Randomized Trials.. International braz j urol : official journal of the Brazilian Society of Urology. DOI PubMed
  5. Luo Y, Zhang J, Guo H (2025). Alpha-lipoic acid on intermediate disease markers in overweight or obese adults: a systematic review and meta-analysis.. BMJ open. DOI PubMed
  6. Sharifi-Zahabi E, Abdollahzad H (2024). Alpha Lipoic Acid Supplementation and Iron Homeostasis: A Comprehensive Systematic Review and Meta-Analysis of Randomized Controlled Clinical Trials.. International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition. DOI PubMed
  7. Prado MB, Adiao KJB (2024). Ranking Alpha Lipoic Acid and Gamma Linolenic Acid in Terms of Efficacy and Safety in the Management of Adults With Diabetic Peripheral Neuropathy: A Systematic Review and Network Meta-analysis.. Canadian journal of diabetes. DOI PubMed
Show 5 more references
  1. Meta-analysisHsieh RY, Huang IC, Chen C, Sung JY (2023). Effects of Oral Alpha-Lipoic Acid Treatment on Diabetic Polyneuropathy: A Meta-Analysis and Systematic Review.. Nutrients. DOI PubMed
  2. Orellana-Donoso M, López-Chaparro M, Barahona-Vásquez M, Santana-Machuca A, et al. (2023). Effectiveness of alpha-lipoic acid in patients with neuropathic pain associated with type I and type II diabetes mellitus: A systematic review and meta-analysis.. Medicine. DOI PubMed
  3. Kishi T, Sakuma K, Miura G, Ito Y, et al. (2023). Alpha Lipoic Acid for Schizophrenia: A Systematic Review and Meta-analysis.. Journal of clinical psychopharmacology. DOI PubMed
  4. Vajdi M, Mahmoudi-Nezhad M, Farhangi MA (2023). An updated systematic review and dose-response meta-analysis of the randomized controlled trials on the effects of alpha-lipoic acid supplementation on inflammatory biomarkers.. International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition. DOI PubMed
  5. Mahmoudinezhad M, Farhangi MA (2023). Alpha-lipoic acid supplementation affects serum lipids in a dose and duration-dependent manner in different health status.. International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition. DOI PubMed