Folic acid is a water-soluble B vitamin. Timely and correct supplementation of folic acid is beneficial to both pregnant women and fetuses. Folic acid supplementation can reduce the incidence of fetal neural tube abnormalities, reduce the incidence of placental abruption and gestational hypertension syndrome in pregnant women, and prevent intrauterine growth retardation in fetuses. The need to take folic acid can be judged according to the pregnancy situation, high-risk groups and relevant examinations. If you are planning to get pregnant, you should take folic acid supplements during the first three months of pregnancy and during the third trimester to promote the healthy growth of the fetus. 2. Judgment according to the high-risk group If you are a partial eater, picky eater or meat eater, or if you are obese, have diabetes, epilepsy and take medication, or if you have a history of deformed children or a family history of neural tube defects, you need to take a high dose of folic acid supplement, consult your doctor for details and adjust the level of folic acid after supplementation. 3. Judgment according to auxiliary examination Such as hospital measurement of serum folic acid, red blood cell folic acid, homocysteine level, and also folic acid metabolism gene test, through the above examination can be clear folic acid overdose, folic acid deficiency, folic acid gene mutation, etc., and then according to the examination results, individualized supplementation. 1. Professionals should be consulted before supplementing folic acid, and the instructions or medical advice should be strictly followed to avoid overdose; 2. What foods are good for folic acid supplementation 1. fruits: oranges, strawberries, cherries, bananas, etc.; 2. vegetables: lettuce, spinach, rape, etc.; 3. nuts: walnuts, cashews, almonds, etc.; 4. others: animal offal, eggs, brown rice, barley, etc.