The human body needs trace amounts of selenium to perform a variety of functions, including synthesizing antioxidants shown to protect against cell-damaging free radicals. Since selenium can 'st be manufactured by the human body, it has to be obtained from diet or supplements. Ultimate Selenium provides selenium, vitamins and other trace minerals and nutrients to support good health. For best results, use Ultimate Selenium as part of a full nutritional program that also includes Healthy Foundation Pak 2.5.