Women take folic acid every day, can prevent some diseases, such as megaloblastic anemia, thromboembolic heart, cerebrovascular disease, anorexia and anorexia nervosa, vascular dementia in old age, depression, etc. Pregnant women supplementing folic acid can also prevent infants from developing diseases with incomplete neural closure. 1. Folic acid is a water-soluble vitamin, folic acid in protein synthesis and cell division and growth process has an important role in the formation of normal red blood cells have a role in promoting. Deficiency of folic acid can reduce the production of hemoglobin in red blood cells and impede cell maturation, leading to macrocytic anemia. Regular supplementation of folic acid can prevent macrocytic anemia. 2. Elevated plasma homocysteine concentration can lead to the occurrence of thrombo-occlusive cardiovascular and cerebrovascular diseases, anorexia, senile vascular dementia, depression and other diseases. After activation, folic acid can be converted into 5,10-methylenetetrahydrofolate, which provides methyl for the conversion of homocysteine into methionine. Regular supplementation of folic acid can prevent the above diseases. 3. Folic acid plays an important role in regulating neurogenesis and programmed cell death, and is effective in preventing incomplete neural closure in infants. It is recommended that women should take folic acid reasonably under the guidance of a doctor, take it as prescribed by the doctor and do not overdose.