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Selenium is an amazing nutrient and vital to your health. It is an essential mineral, meaning it must be obtained through your diet. Selenium plays a major role in important processes in your body, including your metabolism and thyroid function. Research has found that selenium has many benefits and acts as a powerful antioxidant, and has potential to reduce your risk of certain cancers, protect against heart disease, help prevent mental decline, boosts immune system and may reduce asthma symptoms.