Homocysteine 10.3 micromoles per liter is normal. The normal value of homocysteine is 5 to 15 micromoles per liter. Homocysteine is an intermediate product of the metabolism of methionine and cysteine in the diet and is mainly derived from our daily diet. Increased values of homocysteine can cause destruction of blood vessel walls, increased blood lipids, increased blood pressure, and atherosclerosis. This increases the risk of stroke, coronary heart disease, peripheral vascular disease and other diseases. Increased values of homocysteine also disrupt the normal clotting mechanism and increase the chance of thrombosis. Vitamin B6, vitamin B12, and folic acid are involved in the metabolism of homocysteine, and an insufficient intake of these vitamins can lead to increased homocysteine. Therefore, patients with hyperhomocysteinemia should take more B vitamins and folic acid to reduce the level of homocysteine in plasma, thus reducing the risk of cardiovascular disease. Patients with hyperhomocysteinemia should consult a cardiologist and take medication under the doctor’s supervision, and the homocysteine level should be rechecked regularly.