Folic acid can be used for the prevention of neural tube malformations and as a prophylactic medication. 0.4 mg per day is generally recommended. 1. Prevention of fetal neural tube malformation: 0.4 mg once daily is recommended for 3 months during pregnancy preparation and for the first 3 months after pregnancy. 2. Preventive prophylaxis: It can be given to pregnant as well as lactating women as a prophylactic medicine, 0.4 mg per dose, once a day. Folic acid can be taken during lactation to supplement vitamin B. Folic acid can also be secreted through breast milk to provide nutrients for the baby. Common adverse reactions to folic acid include nausea, nausea and gastrointestinal symptoms such as diarrhea, and it is contraindicated in people who are allergic to folic acid. In addition, there are certain risks associated with the use of folic acid, and it should be taken under the supervision of a specialist, not without authorization.