Selenium, as a key factor of glutathione peroxidase, is important and powerful antioxidant. Selenium is incorporated into proteins and creates selenoprotein, which are important antioxidant enzymes. The antioxidant properties of selenoprotein help prevent the destruction of cells and cellular structures against free radicals. Other selenoprotein help in proper functioning and regulation of the thyroid gland and play an important role in the immune system, DNA repair and detoxification of heavy metals. High doses of vitamin C (over one gram) may enhance the absorption of selenium. This metal thus is best taken in conjunction with antioxidants such as vitamin C or E. This formulation provides the best form of selenium in the market, since this has been added vitamin E, which operates in cooperation with selenium.