Herbs of Gold Selenium 150 MAX contains selenium, an antioxidant that reduces free radicals formed in the body. Selenium 150 MAX supports male reproductive system health and maintains sperm motility, production and health. It also helps maintain testosterone formation. Selenium 150 MAX assists the production of thyroid hormones and supports healthy thyroid gland function. Selenium 150 MAX supports immune system health. Selenium is an important component of antioxidant enzyme systems, including glutathione peroxidases. Turnover of selenium is accelerated during times of increased oxidative stress. Selenium 150 MAX maintains selenium levels in the body.