After a blood draw, the body loses some blood, which can be increased through food. Commonly used foods include some foods rich in hematopoietic raw materials, such as iron-rich foods, most commonly animal liver, pig’s blood, sheep’s blood, purple cabbage, black fungus, shiitake mushrooms, jujube, etc. Also, after a blood draw, high quality protein should be added, such as eggs, fresh milk, fresh fish, meat, mutton, and Beef, etc., can provide high-quality protein, providing the necessary raw materials for the regeneration of various blood cells. Also eat more fresh green leafy vegetables, such as celery, spinach, leeks, etc. These foods are rich in folic acid. These foods can provide rich folic acid, which is also an essential raw material for blood production, and can be replenished by eating more of these foods after a blood draw.