Vitamin C as an antioxidant : Production of collagen is affected when the skin is exposed toreactive oxygen species , which are known as free radicals . radicals smoking can cause wrinkles and aging skin early on and in rare cases even cancer . Exposure to sunlight is the reason The main cause of the presence of free radicals . vitamin C reduces the formation of melanin andhelp fight the radicals . known Vitamin C is very unstable. Easily oxidized. As a result, its use is not very effective because it does not have any effect. Much Vitamin C serum products with cheap price, it is unfortunate such products WILL NOT effect. Why? Because Vitamin C serum to create a stable, high technology required. High technology will inevitably result in a product with a fairly high price. BUT very effective