Selenium is a powerful trace mineral that everyone requires for good health. Along with iodine, selenium is great for the thyroid. It supports the immune system and it's a powerful antioxidant.^{[1, 2]} Adults require at least 55 micrograms a day and some people consume more (it's best to stay under 400mcg/day).^[3]

Although fish and meat are sources of selenium, you can get it from several plant sources, which provide a healthier nutritional plan. In fact, many natural foods provide great sources of selenium, including nuts, seeds, and green vegetables.