When the number of red blood cells and the amount of hemoglobin in the circulating blood are lower than normal, it is called anemia. Commonly used clinical iron and blood supplements include ferrous sulfate, ferric ammonium citrate, and iron dextran. Iron is an important component of hemoglobin and myoglobin, and iron deficiency can lead to microcytic hypochromic anemia, also known as iron deficiency anemia, which can also be taken in iron polysaccharide capsules. Polysaccharide iron capsules are rich in iron and have vitamins. Among the iron and blood supplements, it is important to pay attention to vitamin supplementation, especially folic acid and vitamin B6 and vitamin B12. Vitamin B12 can promote the production of hemoglobin and correct megaloblastic anemia.