OLAY Vitamin C Brightening Serum visibly brightens and hydrates for radiant skin. Formulated with vitamin C, vitamin B, and lactic acid, this serum provides powerful ingredients to the skin. The citrus-scented, lightweight formula absorbs quickly, leaving a matte finish that wears well under makeup and SPF. Designed for both morning and night use, it visibly hydrates after just one day. Continued use reveals more even skin tone and a healthy, brightened glow within a month.