Selenium is a mineral found in soil, water, and some foods. It is required in trace amounts for normal health and it is an essential element in several metabolic pathways. Selenium has antioxidant properties that help the body prevent cellular damage from free radicals. One of its most valuable roles is a cofactor of an important antioxidant enzyme in the body called glutathione peroxidase. Selenium also helps support a strong immune system, regulates thyroid function and plays a role in the prevention of cataracts.
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