Pure Lab Vitamins Selenomethionine - 200 mcg - Selenium is a mineral essential to more than 2 dozen types of proteins in the body, including those used in the liver’s blood detoxification processes and by the immune system. Not only is it an antioxidant itself, protecting fats from oxidation; it’s also involved in the production of the antioxidant enzyme glutathione peroxidase, which is used for neutralizing harmful free radicals, viruses and abnormal cells. Selenium is also vital to proper thyroid hormone metabolism, reproduction and DNA synthesis. Selenomethionine is a superior, more bio-available form of selenium with an absorption rate that is better than sodium selenite. Rather than being compounded with food proteins like yeast, selenomehtionine is chelated to a single amino acid. By chelating it to methionine, it becomes the body’s preferred, biologically active form of selenium for immediate use in all its important functions.