Folic acid is a very important nutrient that pregnant women need to supplement during the first 3 months of pregnancy, and also during the early 3 months of pregnancy. A normal pregnant woman needs to take between 0.4 and 1mg of folic acid in 1 day. A normal pregnant woman without high risk factors can take 0.4mg of Silien or take Aleve, which contains 0.8mg of folic acid in each capsule. Folic acid can promote the development of the fetal nervous system and prevent the occurrence of neural tube malformations, and is also helpful for the formation of hemoglobin. For pregnant women who are at high risk, that is, those who have previously given birth to a fetus with neural tube abnormality, high doses of folic acid are required during pregnancy, and this condition needs to be taken under medical supervision.