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 metabolism. Selenium also supports the healthy circulation and immune system, and may help maintain men’s health . Vital Nutrients Selenium 200mcg includes selenomethionine, a high-bioavailability, organic source of this essential trace mineral.