When added to your daily routine, vitamin C provides a range of benefits, from evening out your skin tone, shielding skin from the visible impacts of pollution, significantly improving hydration, and keeping your skin looking younger, longer! Vitamin C has become an increasingly popular ingredient in cosmetic skin-care products. In 1992, Dr. Sheldon Pinnell of Duke University published the results of a study that proved the vitamin-C form of L-ascorbic acid reduced sun damage. This launched further studies that proved vitamin C’s other positive effects on the skin. Now, in the cosmetics world, vitamin C is a star ingredient in facial serums.