Folic acid has a protective effect on the cardiovascular system, especially in a large proportion of patients with high blood pressure, which is caused by H-type hypertension due to folic acid deficiency. Patients with high blood pressure can themselves harm the cardiovascular system, so supplementation with folic acid can help stabilize blood pressure and also indirectly protect the cardiovascular system. Generally, you can have a test for folic acid metabolism, a genetic test, or a homocysteine test to indirectly understand the metabolism of folic acid. Generally, 0.4~0.8 mg of folic acid supplementation per day is sufficient.