Vitamin C is a super hero ingredient for the skin with multiple benefits, especially for mature or damaged skin types. Obagi Professional C Serum 10 uses this powerful ingredient to reveal healthier and brighter skin. Vitamin C promotes collagen production to smooth the appearance of fine lines and wrinkles. The ingredient also brightens skin and promotes a more even tone. This serum defends the complexion against free radicals and other environmental stressors that can cause dark spots, fine lines and wrinkles. The lightweight formula is ideal for all skin types, and the low concentration is great for sensitive complexions.