Obagi Professional-C® Serum 20% is a high-potency antioxidant serum formulated with 20% L-Ascorbic Acid (Vitamin C) to help brighten the complexion, improve uneven skin tone, and reduce the appearance of fine lines and wrinkles. This advanced formula provides powerful antioxidant protection against environmental stressors while supporting collagen production for firmer, smoother, and more youthful-looking skin. Best suited for normal to oily skin and those experienced with Vitamin C skincare, the fast-absorbing serum leaves the skin looking radiant, refreshed, and revitalised. Apply each morning before moisturiser and sunscreen for optimal results and daily protection.