Vitamin C Ester Brightening Serum is a powerful, multi-benefit formula designed to address uneven skin tone and discoloration. This lightweight, herbal-citrus serum features Vitamin C Ester, a highly potent yet gentle form of vitamin C, to visibly brighten, smooth, and promote the look of collagen-rich skin. Formulated with squalane and rosemary leaf extract, it also hydrates while helping to reduce the appearance of fine lines and improve skin’s firmness. For best results, apply after cleansing and before your preferred Perricone MD moisturizer.