Benefits of Selenium 1. Boosts immune function: helps your body fight off infections and recover more quickly from illnesses 2. Supports thyroid health: it converts thyroid hormones into their active forms and the antioxidant properties of selenium protect thyroid gland from oxidative damage 3. Protects against heart disease: reduces oxidative damage to your heart and blood vessels 4. Promotes cognitive function: protects brain cells from damage and reduce risk of cognitive decline 5. Reduces ca