NOW Selenium is a dietary supplement containing 200 mcg of selenium, an essential trace mineral, in each capsule. This yeast-free formula comes in a bottle of 90 capsules and is designed to support antioxidant protection and maintain overall health. Selenium is a trace mineral that plays a vital role in the body's antioxidant defense system and supports healthy immune function. It works with vitamin E to protect cells from free radical damage. This supplement is yeast-free and suitable for vegetarians/vegans. As a dietary supplement, selenium helps maintain proper thyroid function and supports reproductive health. The recommended daily allowance for selenium in adults is 55 mcg per day.