Could pre- and pro-biotic supplements lend themselves to nutritional beauty? What other external forces come into play? Cosmetics & Toiletries posed this question and others to renowned dermatologists Zoe Diana Draelos, M.D., and Alan Dattner, M.D. Following are excerpts adapted from part V in our five-part podcast series, "How Nutrition Impacts Beauty." Hear more by clicking on the podcast at the bottom of the page.