Preservative in insulin dangerous?

Some time back I read a blog on Tudiabetes saying that the preservative in insulin vial is responsible for causing kidney danmage or something like that. Is it true, if yes where can we get more information on it?

There is no basis for such a claim. Most of the time, in my experience, such comments are made by so called “alternative medicine” practitioners who want to promote their woo and scare people off of insulin. These people are usually ignorant of the damage they cause if they succeed in convincing a Type 1 diabetic not to use insulin.