Folic acid is recommended when you are pregnant and should be taken under a doctor’s supervision. Folic acid deficiency in pregnant women is the main cause of fetal neural tube malformations, so it is important to routinely take folic acid supplements after pregnancy to prevent the risk of neural tube malformations in the fetus. Since neural tube closure occurs in 3~4 weeks of embryonic development, and folic acid supplementation can only correct the folic acid deficiency state in the body after 4 weeks, so it is recommended to take folic acid under the guidance of a doctor in the first 3 months of pregnancy and the second 3 months of pregnancy, and whether it is necessary to continue to take folic acid supplementation after the third trimester of pregnancy needs to be asked the doctor in time. Folic acid tablets generally have fewer adverse reactions, during the period of taking this product, taking other multivitamin drugs or health food containing folic acid, please consult a physician; allergic to this product is prohibited, allergic individuals should be cautious. Adverse reactions such as nausea and bloating may occur after taking folic acid. Women with no risk factors can start taking folic acid 3 months before pregnancy as prescribed by the doctor, but those with high risk factors such as a history of neural tube defects in pregnancy should increase the dosage as prescribed by the doctor.