Brazil nut (Bertholletia excelsa Bonpl.) in health and disease: A narrative review ScienceDirect One Brazil Nut a Day: Simple Routine for Selenium (How to Eat Store & Buy) If you've heard the 2 Brazil nuts a day rule, here's what's behind it. Brazil nuts are one of the richest natural sources of selenium, a mineral involved in thyroid function, hormone Brazil nuts are healthy, but they're one of the few foods you actually can overdo pretty fast. They're loaded with selenium, and too much at once can make you feel like absolute Brazil Nuts Terrasoul Superfoods