Obagi Professional C Serum 15% 1 oz.Your skin deserves all the protection you can give it from daily exposure to the suns damaging rays and environmental conditions that cause premature aging. Visible signs of aging, those fine lines and wrinkles, are caused by tiny molecules known as free radicals. Free radicals dramatically multiply with exposure to sun, air pollution and other environmental assaults, ravaging skin cells and breaking down collagen that gives skin its youthful resilience. New Obagi Professional-C Serum uses stabilized ascorbic acid - the only form of Vitamin C that can be effectively absorbed by the skin. You and your Skin Care Specialist can choose from four concentrations to determine which one is right for your skin. New Obagi Professional-C Serums use advanced scientific formulas developed and tested by leading Vitamin C experts. Obagi Professional-C Serums offer maximum daily antioxidant protection and greater penetration than other Vitamin C products. The greater the penetration, the greater the antioxidant benefit to your skin. Vitamin C provides maximum antioxidant protection neutralizing free radicals to prevent skin cell damage. Professional strength Vitamin C can give your skin the superior protection it needs to:Prevent premature signs of aging, including fine lines and wrinklesProtect against future damageStimulate collagen production for firmer, more resilient skinLighten and brighten skin for more even toneIngredients:Propylene Glycol, Water, L-Ascorbic Acid, Alcohol, Ascorbyl Glucoside, Fragrance.