Anti-oxidant are substances that act against oxidants. Antioxidants minimize the damage caused by oxidants. Antioxidant protects one against cardiovascular diseases, cancer, and cataract and slows down the effects of aging. Antioxidants are substances that may protect your cells against free radicals, which may play role in heart diseases, cancer, and other diseases. Free radicals are molecules produced when your body breaks down food or you’re exposed to tobacco smoke or radiation. A diet high in antioxidants may reduce the risk of many diseases.