Brazil nuts are an especially nutrient-rich source of food: They contain important minerals like calcium and magnesium, essential amino acids and unsaturated fatty acids. Brazil nuts are characterized by very high selenium levels, an essential trace element that supports the immune system and protec ts cells from oxidative stress. A single Brazil nut can cover the recommended daily requirement of 55 to 70 micrograms. However, they not only contain this essential nutrient, but also traces of potentially problematic metals like barium and radioactive radium. ...read more read less