Folic acid is a B vitamin, also known as vitamin M. It is widely found in fruits, vegetables and meat foods and plays an important role in the health of pregnant women and newborns, and also helps to reduce the risk of oncological diseases and cardiovascular diseases: 1. Prevention of anemia: The most common anemia in pregnant women and newborns is megaloblastic anemia. Fetal development requires the consumption of large maternal reserves of folic acid. Insufficient or depleted folic acid at the time of delivery or early postpartum can lead to the development of this disease, but it can be restored with adequate folic acid supplementation; 2. Prevention of neonatal malformations: Folic acid is one of the vitamins essential for promoting cell growth and reproduction. Lack of folic acid can directly cause neural tube malformations such as anencephaly, spina bifida, brain bulge, and congenital birth defect malformations such as cleft lip and palate . Studies have shown that adequate folic acid supplementation before and after pregnancy can reduce the incidence of the above diseases to a greater extent; 3, prevention of chronic diseases and inflammatory diseases: supplementation of folic acid helps to reduce the level of homocysteine, which is of some significance for the prevention and treatment of chronic diseases such as uterine cancer, bronchial cancer, esophageal cancer, colorectal cancer, coronary heart disease, cerebrovascular disease, and inflammatory diseases such as chronic atrophic gastritis, colitis and tongue inflammation. 4, other roles: folic acid can reduce habitual abortion, premature birth, low birth weight babies and other conditions to a certain extent, and moderate supplementation of folic acid in men also helps to improve the quality of sperm. In addition, folic acid is widely found in vegetables such as spinach, horsetail leaves, asparagus and tomatoes, as well as fruits such as citrus, strawberries, cherries and kiwi, and is also contained in foods such as meat, animal liver and yeast. Patients are advised to receive medication as prescribed by their doctors and to take appropriate supplements of foods containing folic acid to increase the level of folic acid in their bodies.