Selenium: a component of glutathione, and powerful antioxidant, protects the body from free radical damage and heavy metal toxicity. An anti-cancer and immune stimulant agent. Works with vitamin E to prevent fat and cholesterol accumulation in the bloodstream. Protects against heart weakness and degenerative diseases. Enhances elasticity of skin and body tissue. Deficiency results in aging skin, liver damage, increase oxidation, hypothyroidism, and in severe cases digestive/eliminative trace cancers. Most effective supplement source is selenomethionine. Should be used only from organic sources. Food sources: brewer's yeast, sesame seeds, garlic, tuna, kelp, wheat germ, oysters, fish, organ meats.