The main difference between insulin special refills and insulin refills, insulin special refills are disposable injection devices that have both insulin solution and insulin pens. Insulin refills only contain insulin solution, not insulin injection device, so insulin refills can only be placed in the corresponding brand of insulin injection pen for use. Insulin is the only hypoglycemic hormone in the body. When insulin secretion is insufficient for various reasons, or when resistance to its action occurs, abnormal glucose metabolism occurs, and diabetes can occur in severe cases. Insulin therapy is a very effective way to control blood glucose in diabetic patients, and the use of insulin must be under the guidance of a doctor to choose an appropriate treatment plan. There are many types of insulin, and according to the insulin injection device, it can be divided into insulin special filling and insulin pencil. Insulin refills and insulin refills are the same in terms of specifications, injection dose and usage, with the difference that insulin refills can only be placed in the corresponding brand of insulin injection pen for use.