S e l e n i u m
A cofactor essential to activity of antioxidant enzymes like glutathione peroxidase.
Selenium helps to activate antioxidant enzymes such as glutathione peroxidase, which neutralizes potentially harmful free radicals.
Selenium is needed for healthy muscles, including the heart.
Selenium also plays a role in maintaining healthy eyesight, skin and hair.
55 µg RDA - 400 µg UL
RDA (recommanded dietary allowances) per day 
UL (tolerable upper intake level) per day 
 Food and Drug Administration (FDA)
 Dietary Reference Intakes: Tolerable Upper Intake Levels, Food and Nutrition Board, Institute of Medicine, National Academies, 1997