Antioxidants are substances that keep free radicals under control.
They protect against and correct photo-damage caused by light sources. It is like having millions of little Pac Men® running around and gobbling up the bad reactions that occur within your body. They protect the body from oxidizing the same way that lemon juice keeps an apple from browning. The skin needs supplements to keep it healthy and in good working order just like taking vitamins to supplement our nutrition.