Iron is an essential trace element in the human body. In addition to participating in the synthesis of hemoglobin, iron also participates in biochemical processes in the body. Iron deficiency anemia is an anemia that occurs when the body’s iron stores are exhausted and cannot meet the needs of normal red blood cell production. The body’s stored iron and include bone marrow, liver, spleen and other tissues of iron, iron in the body of 2/3 in hemoglobin, about 15% in myoglobin, and plasma and transferrin synthesized iron for 3-4mg; cells in the various enzymes contain less than 10mg of iron; the rest of the stored iron. The normal human body needs about 20-25mg of iron per day to make fresh red blood cells, most of which comes from the iron released by the destruction of senescent red blood cells. The daily intake of 1-1.5mg of iron from food can maintain the balance of iron in the body.