The human body normally contains 40 to 50 mg/kg of iron, which amounts to 3-4 grams. It is distributed in the following compartments:
Hemoglobin in RBCs - about 30 mg/kg Myoglobin in muscle - about 4 mg/kg Iron-containing enzymes - about 2 mg/kg Storage in ferritin and hemosiderin - 0-2,000 mg Plasma transferrin - 1-2 mg