Selenium is an important antioxidant that protects the body from free radical damage.  It is a component of glutathione peroxidase, an enzyme essential for detoxification of cellular debris.

Selenium, along with other antioxidants, especially Vitamin E, combats free radicals that can cause heart disease.  Selenium may help prevent certain forms of cancer.

Selenium may help those suffering from autoimmune disorders such as rheumatoid arthritis. It is an important component of the immune system. It helps make thyroid hormones and essential fatty acids. Selenium is a part of several enzymes necessary for the body to properly function. Generally, selenium functions as an antioxidant that works in conjunction with vitamin E.