- Iron is an essential mineral found in the body, with 66% stored in hemoglobin and 4% in myoglobin. Small amounts are also bound to enzymes and stored in ferritin and hemosiderin. - Daily iron requirements are 15-20 mg, though only 1 mg is normally absorbed. Requirements are increased during infancy, adolescence, pregnancy, and fetal development, placing additional demands on maternal iron stores. - Iron absorption occurs via divalent metal transporter 1 and ferroportin, and is regulated by the peptide hormone hepcidin which controls ferroportin levels. Transferrin transports iron in the blood and transferrin receptors facilitate its uptake into cells.