Selenium is a trace element that is naturally present in food. Its antioxidant properties help to reduce oxidative stress in the body, which translates into reduced inflammation and improved immunity. If you do not have a nut allergy, it's really easy ensure you have enough Selenium: you eat 3 Brazil nuts every day. If your child doesn't like them or if you need to consider the choking hazard of nuts, you can obtain Brazil nuts in a nut butter. Just keep a tub of Brazil Nuts by your kettle and you'll remember your daily dose.