Selenium yeast is a source of the essential trace mineral, selenium. It is recommended to help support the activation of the antioxidant enzyme glutathione peroxidase and provide the body with nerve, muscle and joint support. Selenium is also essential for enhancing the antioxidant effects of Vitamin E. Selenium helps promote a healthy immune system by supporting the activity of white blood cells, protecting tissue from free radical damage and supporting normal levels of thyroid hormones. Selenium also helps support healthy metabolic function and reproductive health.