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Vitamin A Side Effects & Safety

Evidence:Strong
·

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

  • Hypervitaminosis A with chronic intake above 3,000 mcg RAE — liver damage, headache, nausea
  • Teratogenic at high doses — contraindicated in pregnancy above RDA
  • Bone density reduction with chronic excessive intake
  • Dry skin, hair loss, and cracked lips at toxic doses
  • Beta-carotene may cause harmless orange skin discoloration (carotenodermia)

Drug & Supplement Interactions

  • Retinoid medications (isotretinoin, tretinoin) — combined use increases toxicity risk
  • Warfarin — high-dose vitamin A may enhance anticoagulant effects
  • Hepatotoxic drugs — increased risk of liver damage when combined with excess vitamin A
  • Orlistat reduces absorption of fat-soluble vitamins including A
  • Alcohol increases hepatotoxicity risk of vitamin A

Maximum Dose

Do not exceed: 3,000 mcg RAE/day (10,000 IU) preformed vitamin A (NIH Upper Tolerable Intake Level); beta-carotene has no established UL

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References

  1. Meta-analysisImdad A, Herzer K, Mayo-Wilson E, Yakoob MY, Bhutta ZA (2010). Vitamin A supplementation for preventing morbidity and mortality in children from 6 months to 5 years of age. Cochrane Database of Systematic Reviews. DOI PubMed
  2. Age-Related Eye Disease Study 2 Research Group (2013). Lutein + zeaxanthin and omega-3 fatty acids for age-related macular degeneration: the AREDS2 randomized clinical trial. JAMA. DOI PubMed
  3. RCTAlpha-Tocopherol, Beta Carotene Cancer Prevention Study Group (1994). The effect of vitamin E and beta carotene on the incidence of lung cancer and other cancers in male smokers. New England Journal of Medicine. DOI PubMed
  4. Sinopoli A, Sciurti A, Isonne C, Santoro MM, et al. (2024). The Efficacy of Multivitamin, Vitamin A, Vitamin B, Vitamin C, and Vitamin D Supplements in the Prevention and Management of COVID-19 and Long-COVID: An Updated Systematic Review and Meta-Analysis of Randomized Clinical Trials.. Nutrients. DOI PubMed
  5. Eyeberu A, Getachew T, Tiruye G, Balis B, et al. (2023). Vitamin A deficiency among pregnant women in Ethiopia: a systematic review and meta-analysis.. International health. DOI PubMed
  6. Meta-analysisFarashi S, Shahidi S, Sarihi A, Zarei M (2023). Association of vitamin A and its organic compounds with stroke - a systematic review and meta-analysis.. Nutritional neuroscience. DOI PubMed
  7. Meta-analysisImdad A, Mayo-Wilson E, Haykal MR, Regan A, et al. (2022). Vitamin A supplementation for preventing morbidity and mortality in children from six months to five years of age.. The Cochrane database of systematic reviews. DOI PubMed
Show 5 more references
  1. Zhang H, Ren X, Yang Z, Lai J (2022). Vitamin A Concentration in Human Milk: A Meta-Analysis.. Nutrients. DOI PubMed
  2. Meta-analysisKnapik JJ, Hoedebecke SS (2021). Vitamin A and Bone Fractures: Systematic Review and Meta-Analysis.. Journal of special operations medicine : a peer reviewed journal for SOF medical professionals. DOI PubMed
  3. Knapik JJ, Hoedebecke SS (2021). Vitamin A and Bone Fractures.. Journal of special operations medicine : a peer reviewed journal for SOF medical professionals. DOI PubMed
  4. Zhang L, et al. (2024). The Relationship of Vitamin A and Neonatal Respiratory Diseases: A Meta-Analysis.. Pediatric pulmonology. DOI PubMed
  5. Sudfeld CR, Smith ER (2022). Vitamin a supplementation during pregnancy in shaping child growth outcomes: A meta-analysis.. JAMA network open. DOI PubMed