Mentholated insulin is an insulin analog, which is an ultra-short-acting insulin analog, not a short-acting insulin. Mentholated insulin has an onset of action 5 minutes after subcutaneous injection, peaks in 1-2 hours and lasts for about 4 hours. Compared with short-acting insulin, mentholated insulin has a faster onset of action and a shorter peak time. Therefore, the injection method of Mentholatum insulin is more flexible, it can be injected subcutaneously immediately before meal, or subcutaneously during meal, and if the insulin is missed before meal, it can be made up immediately after meal, and the peak time of Mentholatum insulin is shorter, which can effectively control the postprandial glucose of the corresponding meal, and reduce the incidence of preprandial hypoglycemia of the next meal. However, Mentholated insulin is an ultra-short-acting insulin, which is injected subcutaneously before meals and can only be used to control the postprandial blood glucose of the corresponding meal. In most cases, Mentholated insulin needs to be used in combination with basal insulin to effectively control fasting and postprandial blood glucose and to promote the achievement of glycated hemoglobin.