If you are planning to get pregnant, you should start taking folic acid 3 months before you get pregnant. It has been proven that if folic acid is deficient in the pregnant woman’s body, the fetus is prone to neural tube malformations, which means that malformations such as spina bifida may occur. If you take folic acid too late in the day, not a lot of folic acid gathers in the body, and the development of the neural tube of the fetus is completed in the first 3 months of pregnancy, so you can usually take folic acid as long as you take it until the 3rd month of pregnancy. The eating method is like this, normal women usually take 0.4mg once a day. If you have the condition, you can go to the hospital to do the folic acid metabolism test, to see if your body lacks folic acid or metabolizes it poorly, and if so, you have to increase the dosage under the guidance of the doctor.