Hyperhomocysteinemia carries certain risks, the main potential risk being that it can cause coronary heart disease, stroke, thromboembolism, Alzheimer’s disease, and other cardiovascular diseases. Recent studies have found that elevated homocysteine can also cause cognitive dysfunction, such as schizophrenia is also associated. Elevated homocysteine has also been detected in birth defects in newborns and in habitual abortions in women. Hyperhomocysteinemia is clinically common and is a metabolic disorder. It is usually caused by environmental factors such as excessive intake of animal protein and low intake of folic acid and vitamins. Prevention of hyperhomocysteinemia can be achieved by supplementing vitamin B6, vitamin B12, folic acid, as well as reducing the intake of animal protein and regular exercise, which can effectively reduce the plasma hyperhomocysteine.