Selenium is an essential trace mineral that has numerous health benefits. It helps to boost the immune system, reduce inflammation, improve thyroid function, reduce the risk of cancer, and protect against heart disease. Selenium is also an antioxidant which helps to protect cells from damage caused by free radicals. Furthermore, it can help support healthy brain function, promote normal growth and development in children, and may even slow down aging. Additionally, selenium can help regulate metabolism and blood sugar levels as well as improve fertility in both men and women.