Obagi Professional-C Serum 10% is non-irritating Vitamin-C serum that works to improve uneven skin tone and boost the skins radiance. It is formulated with 10% pure L-ascorbic Acid (Vitamin-C) which provides antioxidant protection against environmental stressors, such as UV rays, which cause damage to the skin and also works to stimulate collagen production. It also inhibits melanin production which helps to fade dark marks and prevent new ones from forming. This serum is able to penetrate into the deeper layers of the skin and doesn’t leave an oily layer. Over time, skin texture is smoother, tone more even and skin has a healthy glow. Suitable for use on Normal, Dry and Sensitive Skin types.