Insulin lispro is a substance used in the management and control of blood sugar in patients suffering from diabetes. This product needs to be used in conjunction with a proper diet as well as an exercise routine in order to be effective. Regular use will ensure protection of organs and prevention of kidney damage, loss of limbs and sexual dysfunction. Insulin lispro is artificially prepared and closely resembles natural insulin found in the body. The main purpose of this product is to replace the insulin that the body does not produce. It is sometimes used with other products to enhance its actions.