Vitamin C occurs naturally in the body, where it has a key role to play in keeping skin healthy and supple. It supports the synthesis of collagen, a protein that helps skin repair itself at a cellular level. As skin matures, the amount of vitamin C that is retained in the dermis and epidermis decreases. In turn, collagen levels drop, leaving skin vulnerable to fine lines and wrinkles. Levels of vitamin C can also decline if the skin is exposed to UV rays or environmental pollutants, such as cigarette smoke. Topical application of vitamin C can help to replenish levels of this key nutrient. By including creams, lotions or serums containing vitamin C in your daily routine, you can help to keep your complexion looking radiant and youthful.