Obagi Professional-C Serum 10% infuses your skin with L-ascorbic acid, the only form of vitamin C suitable for topical application. Designed to penetrate deep into your skin, this formula provides effective antioxidant protection from UV damage as it brightens away hyperpigmentation and encourages the growth of collagen and elastin fibers. | Obagi Medical Professional-C Serum 10%, 1 fl. oz | Dermstore