Dear Jack ,
One cannot stop giving insulin until the body no longer requires it. After giving Dia-IonX for a while some owners have reported that they have been able to reduce the insulin dosage and some have been able to stop giving it because their dog no longer needed it. However, each patient is unique and has its own set of circumstances. In addition, I find it helpful to give digestive enzymes with each meal, Canine Probiotics, MSM, and Omega 3,6,9 daily. Dia-IonX will help the body better utilize the other supplements. In addition make sure that you offer sufficient water free of chlorine and fluoride. A regular exercise schedule is also helpful in moving glucose from the blood and into the muscles which will reduce the blood glucose.
It is important that you monitor the blood glucose levels so that you can ask your veterinarian about adjusting the insulin dosage when necessary. If the blood sugar level has been consistent then you will need to add something more to see if there will be less of a need for insulin.
Please let us know how you progress and if you have any other questions.