The correct way to eat folic acid depends on the use, generally adults take orally, once 5-10mg, 15-30mg a day, such as folic acid deficiency anemia, can be taken orally to treat anemia. Children, 5mg once a day, 3 times a day. Preventive medicine for pregnant and lactating women, 0.4mg once a day, once a day, starting in the first trimester of pregnancy and continue to take until the 12th week of pregnancy. In the case of experimental treatment, the physiologic dose of 0.5 mg a day should be used. Oral folic acid should be taken half an hour after a meal, which can effectively reduce the stimulation of the gastrointestinal tract and is conducive to the efficacy of the drug. Adverse effects are rare, and allergic reactions are rare. Gastrointestinal symptoms such as fear of food, nausea and abdominal distension may occur with prolonged use of the drug. When large amounts of folic acid are taken, it may cause the urine to be yellow in color. Precautions: large amounts of oral intake may cause the absorption of trace elements zinc; nutritional megaloblastic anemia requires simultaneous supplementation of iron and high-quality protein, other B vitamins; unless it is malabsorption patients, generally do not need long-term treatment. Specific need to be diagnosed according to the test results, under the guidance of the doctor to determine the treatment and dosage, to avoid personal abuse caused by adverse reactions.