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Input: The concentration  or number of insulin units in the liquid solution  was labeled as 100 units per milliliter. But they averaged less than half of that  and none met the 95-unit minimum standard  said lead researcher Alan Carter  a pharmacist and adjunct instructor at the University of Missouri-Kansas City School of Pharmacy.
 Carter  thinks the insulin may have gotten too warm somewhere between the factory and the pharmacy  causing some of the molecules to break apart.
 Carter  wondered whether  his  results might help explain why insulin users sometimes find a dose doesn't work as well as normal. Doctors usually attribute that to patient error: not injecting enough insulin before a meal  not following dietary guidelines  or skipping exercise.
 Carter   who had a limited budget for  his  study  acknowledges that it was too small and that  his  results may be flawed. He notified Novo Nordisk and Eli Lilly of his results in hopes someone would do a bigger follow-up study.

Insulin quality questions have diabetes experts scrambling