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- 2
the insulin you use has to be kept at room temperature!, many places in the home, school, work & outside on hot days, in the car or on holidays can exceed 30'c, this can and will impair the insulin & the insulin should be replaced. i use insulin angels, they just stick to the insulin tube or pen and go black when i leave it in the wrong place and i instantly know its impaired and get some fresh and put a new insulin angel indicator on it!, now i know the insulin is as good as fresh from the fridge.