Selenium is an essential trace mineral that supports the immune systemselenium is an antioxidant that protects vitamin e from degradation. It helps to build the immune system by destroying free radicals, and aid in the production of antibodies. Selenium is absorbed through the intestines and stored in the liver, kidneys, and muscles. The lower the selenium intake the higher the incidents of cancer. Selenium fortifies heart energy cells, making sure they get enough oxygen. Selenium helps eliminate arsenic. Helpful in stroke prevention. Helps protect against the effects from arsenic, cadmium and mercury. Component of glutathione peroxidase, protecting tissues from the effects of polyunsaturated fatty acid oxidation.