Also called vitamin B5, and often touted as being effective for acne. However, there is only one study supporting this notion and it dates from the early 1980s (Source: International Journal of Dermatology, 1981, volume 20, pages 278–285). There is no current research showing this to be an effective treatment for acne, but there is a small amount of research showing that it can be effective for hydration and wound healing (Source: American Journal of Clinical Dermatology, 2002, volume 3, number 6, pages 427–433).