Graded against 173,636 supplements + 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, NIH DSLD
Vitamin A
MODERATE EVIDENCEVitaminLast updated
AVELOR SUMMARY
Retinol (preformed A, from animal sources) vs beta-carotene (provitamin A, from plants). Preformed A is 12x more bioavailable. Excess preformed A is TERATOGENIC (birth defects — limit to 3,000 μg/day in pregnancy). Beta-carotene does NOT cause toxicity (conversion is regulated). Retinoic acid (active form) regulates 500+ genes.
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*Reviewed by the Dose AI Research Team and Clinical Advisory Board*
*Last updated: 2026-04-06*
Independently graded against 173,636 indexed supplements with 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, and NIH DSLD | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.