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This is something that has bothered me. A small vial of insulin is so expensive. And the formula to make it hasnt really been changed significantly. It should be generic by now. Without health insurance, it would be impossible to afford.
It's odd, because there is much cheaper insulin that can be purchased at retail outlets. I've heard that stuff isn't identical and some people can't use it, but it does seem to prove the concept.
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It is probably made using a different method. Medicine companies like to tweak their formula slightly so that they can keep their patents.
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