Now Selenium 200 mcg Mineral Supplement Capsules For Antioxidant Support helps your body fight oxidative stress and defend your body. Oxidative stress is believed to be involved in both the onset and progression of neurological diseases. Selenium may help keep your heart and neurological functions healthy by keeping oxidative stress in check and reducing your risk. Selenium is an essential trace mineral that is found naturally in Brazil nuts, organ meats, seafood, and wheat germ. It is one of the seven essential minerals your body needs to stay healthy and work at its best. Known as a trace element, selenium benefits vital functions within the body including immunity, DNA synthesis, and protection from oxidative stress. Higher blood levels of selenium may help improve quality of life.