Discover Perricone MD Vitamin C Ester CCC + Ferulic Brightening Complex 20%, an ultra-potent, supercharged serum rich in antioxidants and formulated with proprietary Vitamin C Ester and two additional forms of vitamin C for highest concentration of 20%. Works together with vitamin E and ferulic acid to visibly brighten, smooth and minimize discoloration and dark spots over time. Designed with a powerful phospholipid delivery system to penetrate the deepest layer of skin\'s surface for maximum benefits.