Obagi Professional-C Serum 15% lightens and brightens skin while reducing fine lines and wrinkles due to aging. Care for your skin with proven anti-aging Vitamin C formulas from Obagi. Vitamin C protects the skin from free radicals and can even help reverse the signs of sun damage. Not all Vitamin C skin care products are the same. Obagi's Professional-C series offers the highest quality pure Vitamin C in a stable formula. Give yourself the best!