Raw and unsalted.
Brazil nut trees, which grow in Bolivia, Brazil & Peru, produce fruit almost exclusively in pristine forests, as disturbed forests lack the large-body bees which are the only ones capable of pollinating the tree's flowers.
Brazil nuts are 18% protein, 13% carbohydrates, and 69% fat. The fat breakdown is roughly 25% saturated, 41% monounsaturated, and 34% polyunsaturated. The saturated fat content of Brazil nuts is among the highest of all nuts, surpassing even macadamia nuts. Because of the resulting rich taste, Brazil nuts can often substitute for macadamia nuts or even coconuts in recipes.
Nutritionally, Brazil nuts are perhaps the richest source of selenium, containing as much as 1180% of the USRDV. They are also a good source of magnesium and thiamine. Some research has suggested that selenium intake is correlated with a reduced risk of both breast cancer as well as prostate cancer. Selenium has also been cited as strongly benefitting various other conditions, such as HIV, lung cancer, colon cancer, and dandruff, as well as boosting a health.