Elderly people are able to take folic acid, which is a raw material for the synthesis of red blood cells, and a deficiency of folic acid can lead to megaloblastic anemia in the elderly. Therefore, older people with megaloblastic anemia need to take folic acid supplements to correct the anemia. In addition, folic acid deficiency also leads to hyperhomocysteinemia, which is closely related to the occurrence of H-type hypertension and ischemic stroke. Therefore, elderly people suffering from hypertension, cerebral infarction and atherosclerosis also need to take folic acid to fight atherosclerosis and prevent cardiovascular and cerebrovascular diseases. Elderly people should stick to small doses when taking folic acid, as too large a dose can easily cause gastrointestinal reactions such as bloating, nausea and vomiting. At the same time, it should be taken in combination with vitamin B12, which has a better effect.