Folic acid contraindications in no cardiac function decline, so the heart is not good people can use folic acid, but should be taken in accordance with medical advice. Folic acid is mainly indicated for various causes of folic acid deficiency caused by megaloblastic anemia, but also as a preventive drug for pregnant and lactating women. Folic acid dosage should be strictly controlled, large doses will affect the absorption of trace elements zinc. Folic acid supplementation is generally not used for maintenance therapy, the effects of the drug in the elderly have not been clarified, and it can be used in people with decreased heart function, but it does not have the effect of treating heart disease. Folic acid has fewer adverse reactions, rare allergic reactions, the use of which should be carried out under the guidance of a doctor, daily attention to balanced nutrition and good habits.