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Selenium is a trace mineral that is found in the soil and plants. While it is toxic to humans in large doses, selenium does play an important role in nutrition. For one, selenium is necessary for the proper functioning of the thyroid gland – and every other cell in the body that uses hormones produced by the thyroid. Studies have also shown that selenium is a powerful antioxidant, which means that this mineral can help battle the effects of aging, among many other things.

Selenium also potentially provides protection from the flu, cancer, and arthritis.

Chemical Symbol: Se