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Selenium is a mineral which may increase the effectiveness of antioxidants in the body. It may be effective in treating diseases of the heart and blood vessels and may have anti-carcinogenic properties, which help reduce the risk of cancers such as those of the prostate, stomach, lung and skin. Selenium is also used for treating conditions such as an under-active thyroid, osteoarthritis, rheumatoid arthritis, and chronic fatigue syndrome. The mineral may also be beneficial for the eyes and may be useful in premature graying of hair.