Selenium is a trace element and potent antioxidant that is essential to the body in small amounts.* Selenium helps cells to function normally by supporting the action of several enzymes, particularly antioxidant enzymes and those involved in thyroid hormone metabolism.* Selenium also supports the cardiovascular and immune systems, and may help maintain prostate health .* Vital Nutrients Selenium 200mcg includes selenomethionine, a high-bioavailability, organic source of this essential trace mineral.*