@mikeinspain – re the pen in use – My thoughts are – no worse than the insulin in the cartridge in a pump – and a pen holds the same as the cartridge so is in use for a similar amount of time (not quite as long as you do they basal as well as the bolus, but if you have a low basal rate, it only amounts to a couple of days worth). Its always at close to body heat etc. So they must stand up to body heat, or the pump manufacturers wouldnt be able to use them. (I hope that makes sense. Its rather difficult to explain what I’m trying to suggest…)
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