The Obagi Professional-C Peptide Complex works to visibly improve the skin’s firmness, tone, and elasticity. This effective anti-aging treatment contains important growth factors, Kinetin and Zeatin, to boost collagen production in the skin for the creation of new healthy skin cells that will leave the skin looking smooth and radiant. The serum also contains L-Ascorbic Acid (Vitamin C) for added antioxidant protection against harmful free radicals in the environment that can cause premature signs of aging. With daily use, you will begin to notice your skin having a more vibrant, youthful appearance.