Beauty and health supplements work by promoting health inside your body, by boosting antioxidant status, and fighting inflammation and/or stimulating collagen growth,” say, Lyssie Lakatos, RDN, CFT, and Tammy Lakatos Shames, RDN, CFT, the Nutrition Twins and creators of The 21-Day Body Reboot in New York City. “This is instead of being used topically like cosmetics.”  As well, health supplements can help address underlying nutritional deficiencies that are difficult to correct through diet, adds Willingham. “Sometimes we experience physical or aesthetic consequences from nutrition deficiencies, such as decreased hair quality or thickness,” she says. “If needed and used correctly, supplements can indirectly improve aspects of our aesthetic appearance.