The effect of folic acid on blood vessel blockage is only indirectly preventive. Folic acid can reduce the concentration of homocysteine in the blood. Since homocysteine can cause damage to the lining of blood vessels and increase the chance of heart attacks, strokes and other cardiovascular diseases, taking folic acid can indirectly prevent blood vessel blockage. In daily life, folic acid can be consumed from green vegetables and animal liver, which are more widely available sources. However, if blood vessel blockage has already occurred, supplemental folic acid can only play a certain auxiliary role, and cannot treat the blood vessel blockage, and it is more important to treat the primary disease at this time. Blood vessel blockage is usually a blockage in the blood vessels of the brain and heart, which can be treated by removing the embolus or placing a stent to recirculate the blocked blood vessels through interventional methods. In addition, women often take folic acid in preparation for and during pregnancy, which can prevent fetal neural tube malformations, spina bifida, cleft lip and palate, and megaloblastic anemia. However, it should be noted that although folic acid has certain benefits to the human body, it should not be oversupplemented, and it is best to take it under the guidance of a doctor. Excessive supplementation may, on the contrary, affect your health, causing symptoms such as loss of appetite, poor mental health, vomiting, etc., and may jeopardize the nervous system in serious cases.