Dermatologist Rajani Katta, MD, explains how vitamins are (and aren’t) regulated, how to judge the safety and efficacy of skincare supplements, and the truth about collagen powders, biotin, vitamin A, and other hair, skin, and nail vitamins. Plus, we learn how your diet affects your skin and hair, which supplements can alter results of medical tests, and how certain foods can help neutralize free radicals and protect against damage. This interview originally aired in 2020 and has been re-edited and includes a new introduction. 

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