PMID: 9431575Feb 7, 1998Paper

Periconceptional vitamin A use: how much is teratogenic?

Reproductive Toxicology
R K MillerU W Wiegand

Abstract

The objective of the review is to determine whether preformed vitamin A (retinol and retinyl esters) is teratogenic at dosages commonly used by women living in industrialized countries. Published human and animal data and research developed by the authors are reviewed. It is well known that vitamin A is essential for normal reproduction and development. Although doses of 10,000 IU/d or less of preformed vitamin A (retinyl esters and retinol) are considered safe, doses > 10,000 IU/d as supplements have been reported to cause malformations in a single epidemiologic study. Nonhuman primate data show no teratogenicity at doses of 30,000 IU/d. Daily periconceptional exposures greater than 25,000 IU/d of preformed vitamin A have not been sufficiently studied to establish specific risk. Because no study reports adverse effects of 10,000 IU/d preformed vitamin A supplements and this dose is more than the Recommended Dietary Allowance for pregnant women (2670 IU or 800 RE/d), we recommend that women living in industrialized countries or who otherwise have nutritionally adequate diets may not need to ingest more than the Recommended Dietary Allowance of preformed vitamin A as supplements. If periconceptional vitamin A exposures to levels...Continue Reading

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