Selenium Supplement Antioxidant Support for Immunity & Thyroid Health The selenium dependent antioxidant system of glutathione peroxidases Download Scientific Diagram Selenoglutathione Diselenide: Unique Redox Reactions in the GPx Like Catalytic Cycle and Repairing of Disulfide Bonds in Scrambled Protein Biochemistry Redox Active Selenium CompoundsFrom Toxicity and Cell Death to Cancer Treatment Selenium is a vital trace mineral that quietly supports some of the body's most essential functions, yet it's often overlooked. If you're taking a high quality multivitamin, you may be getting some selenium.