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L-SelenomethionineCardiovascular and Prostate Health100 mcg Per CapsuleMineral SupplementProvides Antioxidant SupportMaintains Cardiovascular Thyroid and Immune HealthSupports Prostate HealthScience-Backed Quality Since 1969Shore up your antioxidant defenses with Swanson Selenium! As a key component of one of the body's primary antioxidant enzymes selenium provides vital protection for the heart prostate and many other organs and systems throughout the body. Our high-potency capsules deliver 100 mcg of elemental selenium from selenomethionine a high-absorption source of this essential trace mineral.