Source Naturals, Selenium, 120 Tablets

Dietary Supplement Yeast Free From L-Selenomethionine 200 mcg Non GMO Validated Selenium is a powerful antioxidant and an essential trace mineral that functions as a component of various enzymes and proteins, called selenoproteins. As part of these proteins, selenium not only helps protect cells from oxidative stress caused by free radicals, but it also plays important roles in the immune system and the thyroid gland.