From the Manufacturer:
Free radicals are highly reactive compounds that are created in the body during normal metabolic functions or introduced from the environment. Free radicals are inherently unstable, since they contain “extra” energy. To reduce their energy load, free radicals react with certain chemicals in the body, and in the process, interfere with the cells’ ability to function normally. Antioxidants work in several ways: they may reduce the energy of the free radical, stop the free radical from forming in the first place, or interrupt an oxidizing chain reaction to minimize the damage caused by free radicals.