Folic acid supplementation can be done by eating foods such as green leafy vegetables, liver, nuts, beans and eggs, in addition to oral folic acid tablets or multivitamins containing folic acid. For women preparing for pregnancy, it is recommended to start taking oral folic acid tablets or multivitamins containing folic acid three months before preparing for pregnancy, which can be continued to the postpartum period, not only preventing neural tube malformations, but also preventing some of the anemia during pregnancy. Fresh vegetables and fruits, animal liver, nuts, beans, eggs and other foods in daily life are also rich in folic acid, but the utilization rate of folic acid in food is relatively low. Folic acid is a water-soluble vitamin and can be excreted through the kidneys if taken orally in excess, but it is recommended that oral folic acid-containing medications be taken as prescribed by a doctor.