There is no concept of “blood supplement” food in medicine. Usually, people refer to “iron supplements” as blood supplements. Iron-supplementary foods include animal blood, liver and red meat, etc. These foods are rich in heme iron and are easily absorbed. Iron-supplementing foods are mainly animal foods, especially animal blood and liver. In addition, red meat (mammals) can also be effective in iron supplementation due to its high hemoglobin and myoglobin. Including beef, pork, lamb and so on. Plants (spinach, etc.) are also high in iron, yet are not easily absorbed. This is because the iron in plants is trivalent iron, which must be reduced to divalent iron to be effectively absorbed, while phytic acid and oxalic acid in plants affect the absorption of plant iron, but animal hemoglobin iron is unaffected by these components. It should be noted that not all patients with anemia need iron supplementation, such as thalassemia patients are prohibited blind iron supplementation, anemia patients are recommended to clarify the cause of the targeted treatment.