High-potency vitamin C serum for brighter, firmer, more even skin Unlock your best skin with Obagi Professional-C Serum 20%. This advanced serum uses 20% L-Ascorbic Acid the most researched form of vitamin C paired with sodium hyaluronate, to help brighten skin tone, reduce the appearance of dark spots, strengthen antioxidant defenses, and visibly improve fine lines and texture. Key Benefits Brightens & evens skin tone: reduces visible discoloration and dark spots. Strengthens antioxidant defense: fights free radicals and supports skin against oxidative stress. Improves fine lines & texture: helps smooth appearance of wrinkles and refines skin surface. Plumps and hydrates: sodium hyaluronate supports moisture retention and skin comfort. Fast-absorbing & suitable for multiple skin types: designed for normal to oily skin, also beneficial for other types when used appropriately.