Ok-Im very concerned because I am under the impression that Insulin is Insulin. I have talked to 2 Vets that I do not no very well (did not call my reg Vet) in fear that they will fuss. It costs me 96.00 a month for him and why cant I just use regular insulin. Both of the vets I talked to have never used Vetsulin and use regular insulin when treating there patients. What is the difference? I understand that selling their products is a plus but right now in this day of time I can not afford the 100 and if I can treat him the same way with a regular non-prescription insulin from a pharmacy why shouldnt I? But again I will do what I have to do and if I have to buy the Vetsulin I will for the love of my dog and the fear of losing him. Please help me I am at my wits end with everyone trying to take money.