Usually all aspects of nutrition adequate people do not need to take extra folic acid, preparation for pregnancy, pregnancy, megaloblastic anemia patients need to take folic acid, can prevent fetal neural tube malformation and treatment of anemia. Usually all aspects of nutrition adequate people, through the diet can supplement the body needs folic acid, such as peas, lentils, oranges, there is no need for additional folic acid supplementation in the absence of abnormalities. Women who are preparing for pregnancy or during pregnancy have a higher demand for folic acid, and supplementing folic acid through diet is not enough. Taking extra folic acid can prevent fetal neural tube malformation and reduce the risk of fetal cleft lip and palate, anencephaly, and so on. People with megaloblastic anemia, caused by the body’s lack of vitamin B12 or (and) folic acid, this situation to supplement folic acid in order to treat the disease. Folic acid belongs to the B group of vitamins and is recommended for safe use under medical supervision.