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Vitamin E Side Effects & Safety

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Safety Profile

Overall safety rating: Safe with Caution

Potential Side Effects

  • Increased all-cause mortality at doses ≥400 IU/day (Miller et al. 2005 meta-analysis)
  • Increased risk of hemorrhagic stroke at high doses
  • May increase prostate cancer risk in healthy men (SELECT trial, 2011)
  • GI discomfort (nausea, diarrhea) at high doses
  • Increased bleeding risk due to antiplatelet effects

Drug & Supplement Interactions

  • Anticoagulants (warfarin) — vitamin E enhances anticoagulant effects and increases bleeding risk
  • Chemotherapy and radiation — antioxidant effects may theoretically reduce treatment efficacy (consult oncologist)
  • Statins and niacin — vitamin E may reduce the HDL-raising benefit of niacin
  • Vitamin K — high-dose vitamin E may interfere with vitamin K-dependent clotting factors

Maximum Dose

Do not exceed: 1,000 mg/day (1,500 IU natural or 1,100 IU synthetic) NIH UL; meta-analyses suggest risk increases at ≥400 IU/day

Full Vitamin E Guide

References

  1. (). Meta-analysis: high-dosage vitamin E supplementation may increase all-cause mortality. Annals of Internal Medicine. DOI
  2. (). Vitamin E and the risk of prostate cancer: the Selenium and Vitamin E Cancer Prevention Trial (SELECT). JAMA. DOI
  3. (). Vitamin E supplementation and in vivo immune response in healthy elderly subjects: a randomized controlled trial. JAMA. DOI
  4. (). Effect of vitamin E and memantine on functional decline in Alzheimer disease: the TEAM-AD VA cooperative randomized trial. JAMA. DOI