What's inside brazil Nuts, and where does it go in your body?
A single nut can contain more than a day's selenium — so a few a day is plenty.
Notable for
Selenium (very high, varies with soil), magnesium, copper.
Dose matters
Eating many every day can push selenium above the upper limit.
Evidence & sources
A 1-ounce serving of Brazil nuts (6–8 nuts) can contain about 544 mcg of selenium — above the adult upper limit of 400 mcg. Evidence: established. Known: Listed in the NIH food-source table. Unknown: Selenium content varies widely with the soil where the nuts grew. Source: NIH Office of Dietary Supplements, Selenium Fact Sheet for Health Professionals (Current revision).