Dr. Rajani Katta, a dermatologist and nutrition expert, explains how vitamins are (and aren’t!) regulated, how to judge the safety and efficacy of supplements, and the truth about collagen powders, biotin, vitamin A, and other hair, skin, and nail vitamins. Before the interview, Jenn & Jess talk about the beauty industry’s continued fixation on “unboxing” and discuss the week’s beauty news: more brands dropping the racist language used to market skin-evening products, Space NK’s U.S. store closures, Coty’s investment in KKW Beauty, the first curbside-recyclable pump for a skincare product, a perfume that smells like space, and the health risks of the preservative butylparaben.

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