Life Extension Selenium and Vitamin E Vitamin Supplement Found in the diets of the world's longest-living people: People living in "blue zones" have many things in common; one of them is the amount of selenium in their diets. Selenium is an antioxidant that helps cells fight oxidative stress. Heart and Brain Support: Selenium’s ability to promote a healthy inflammatory response contributes to its support for heart and brain health, in addition to healthy cell division. Selenium also supports a healthy response to immune system challenges. Thyroid Maintenance: Selenium plays a vital role in thyroid health by aiding in the conversion of the thyroid hormone T4 to T3. This helps your body maintain healthy thyroid function. Ingredients Matter: We use only the finest raw ingredients with the purity and potency you deserve. Most of our products are non-GMO, gluten-free, and made in the USA, and a Certificate of Analysis is available for all. Live your healthiest life: We believe that the answers to a healthier life are within reach and that scientific research is the key to getting there. That's why many of our formulas feature specific ingredients and amounts based on scientific studies.