Liver/Detox Thyroid Support Gluten Free Dietary Supplement Well-absorbed form of selenium that supports healthy heart, cell development and thyroid function. Selenomethionine is selenium bound to the amino acid methionine. Selenium is an antioxidant mineral cofactor for the body's natural antioxidant systems – SOD and glutathione. Selenium is an important trace mineral, and selenomethionine is one of its a well-absorbed forms. It exerts important positive effects on normal cell function and cell development. It is also necessary for conversion of the thyroid hormone T4 (thyroxine) to the active T3 form (triiodothyronine). Numerous studies have found that maintaining normal serum selenium levels is associated with support for normal cell function and differentiation, as well as healthy heart, connective tissue, eye, liver, and thyroid function. Selenium supplementation also might exert a protective effect against mercury, cadmium, and other toxic heavy metals. A significant body of research also supports selenomethionine's benefit in other situations, including healthy thyroid function and nutritional support for oncology patients.