Folic acid, also known as vitamin B9, is a water-soluble vitamin widely found in a variety of vegetables and fruits, and is also known as folic acid because its original extraction is in spinach leaves. Folic acid is very helpful in preventing anemia and preventing leukopenia. In the human body, folic acid is involved in a variety of metabolic processes in the body, and among them, the reactions it is involved in when it is involved in amino acid metabolism can help keep people away from type H hypertension. The full name of type H hypertension is essential hypertension with homocysteinemia. Homocysteine, also known as blood homo, is a heterozygous form of our essential amino acid, cysteine, and a normal product of amino acid metabolism in our body, which is converted from another amino acid called methionine. However, this amino acid is not only not particularly beneficial to the human body, but can also cause harm to the human body at higher concentrations. Experts and scholars have shown that high concentrations of homocysteine can have direct damaging effects on the cardiovascular and immune systems, as well as the brain and nerves. However, homocysteine can be broken down in the body to recreate cysteine and methionine. This process requires the involvement of folic acid. If the intake of folic acid is not sufficient, the smooth functioning of the reaction will be affected and the homocysteine level in the blood will increase, which can cause severe homocysteinemia. This disease can increase the risk of coronary artery disease, increase its mortality, and cause interference with the brain nerves, promoting the development of diseases such as Alzheimer’s disease. When combined with hypertension, this disease can lead to episodes of H-type hypertension, which is hypertension with hyperhomocysteinemia. H-type hypertension is said to “affect the Chinese” and can lead to strokes, which are 1.5 times more likely to occur in Chinese than in Westerners. Such a high incidence cannot go unnoticed. Among the causes of hyperhomocysteinemia and H-hypertension, insufficient folic acid intake is almost certainly present. Folic acid is widely available in our daily diet, most often in fresh vegetables and fruits. In studies of H hypertension, scientists have found that people who consume more fruits and vegetables are less likely to be affected by the disease, another indication of the important role of folic acid. Although there are many foods containing folic acid, the body does not really get much folic acid from food because it is unstable when exposed to light and heat and easily loses its activity. The fresher the vegetables and fruits are, the more folic acid they contain. Therefore, it is recommended that the daily diet should be based on freshness, while paying attention to supplementation with foods rich in folic acid. Many green vegetables such as spinach, rape and chard are rich in folic acid, and various fruits such as strawberries, peaches, apples and pears are also rich in folic acid. Animal liver, poultry eggs, etc. also contain more folic acid, beans, nuts, cereals also contain folic acid inside. The usual diet can be properly adjusted and reasonably matched.