Discover Obagi’s bestselling Professional C® Serum 20%, formulated with 20% L-Ascorbic Acid and Sodium Hyaluronate. Fast-absorbing serum helps to brighten and even skin tone, reduce the appearance of dark spots, strengthen antioxidant defenses, and improve the appearance of fine lines and wrinkles. For a supercharged, hydrated glow and more youthful-looking skin. Ideal for normal to oily skin types. Combats oxidative stress induced by blue light and infrared radiation* that cause early signs of skin aging Formulated with L-Ascorbic Acid to brighten skin Helps to neutralize free radicals *2023 In-Vitro Antioxidant Potential Assay. Data on file at Obagi Cosmeceuticals LLC.