The insulin specification usage is subcutaneous injection and the dosage varies from person to person. The size of insulin is 3ml and contains 300U of insulin. The size of insulin injections varies for people with different conditions. Normal insulin is usually injected subcutaneously, 3-4 times a day. A larger portion is injected at breakfast, and the smallest amount is used for injections before lunch and dinner. Sometimes both intramuscular and intravenous injections can only be used in emergency situations, such as diabetic coma. Because the amount of insulin required by a patient is influenced by diet, body calories, body weight and body fat, intensity of physical activity, insulin antibodies, number of receptors and affinity, the dosage of insulin varies. Insulin plays a very important role in the treatment of high blood glucose and has a profound effect on the regulation of abnormal increases in blood glucose in the body.