Moreover, a 1999 study reported no congenital malformations among 120 infants exposed to more than 50,000 IU of vitamin A per day. (bembu.com)
The study, published online May 1 in Nature Biotechnology, was led by Karl R. Koehler, PhD, assistant professor in the Department of Otolaryngology and Head and Neck Surgery at IU School of Medicine, and Dr. Hashino in collaboration with Jeffrey Holt, PhD, professor of otology and laryngology at Harvard Medical School and Boston Children's Hospital. (sciencedaily.com)
The National Institutes of Health recommends 600 IU per day (or 15 mcg). (businessinsider.com)