Oxidation is a natural and necessary process in which cells are broken down or converted to other forms. Although oxidation reactions are crucial for life, too much can be damaging, and plants, animals, and people maintain complex multiple antioxidant systems including vitamins, minerals, enzymes, and dietary antioxidants. Pollution, physical and mental stress, drugs, alcohol, and other chemicals can increase oxidation. Excess oxidation creates free radicals that are linked to age-related degenerative conditions, including vision problems, heart disease, diabetes, osteoporosis, and Alzheimer’s disease. It is wise to consume antioxidants from a wide variety of sources to support overall health. Selenium is a trace mineral and antioxidant which works with vitamin E to prevent free radical damage to cell membranes. High incidence of breast cancer and cardiovascular disease have been reported where low levels of selenium are found in people’s diets.