Antioxidants are substances that protect your cells against oxidation, especially oxidation by molecules called free radicals. Free radicals can damage cells, and may play a role in heart disease, cancer and other diseases. Vitamins a, c, e, as well as beta-carotene, lutein, lycopene, and selenium, are common antioxidants. Foods high in antioxidants include fruits, vegetables, nuts, and grains.
