Antioxidant vitamins and minerals are natural compounds that help protect the body from harmful free radicals. Free radicals are atoms or groups of atoms that can cause damage to cells, impairing the immune system and leading to infections and various degenerative diseases. The best known antioxidant vitamins and minerals are vitamin A, beta-carotene, vitamins C and E, the minerals Selenium, Zinc, Manganese, Copper, and Iron. The body uses these elements to make free radical enzyme scavengers; which neutralize the free radicals. The present paper describes these nutrients in relation to their antioxidant activity and also explain the need of dietary supplementation of such vitamin and mineral in ruminants for maintenance of health and productivity. 1360060287.php