Officially you aren’t allowed to share or pass on prescription items to others unfortunately
@EmmaL76 
plus, as you say the transport of the insulin in current weather might make it degrade or behave unpredictably. So annoying if you have a surplus and can see others in need - but there are lots of understandable rules and regs about such things.
Hopefully the shortage won’t last long, and stability will return shortly. My biggest hope is that people don’t start stockpiling, which could make the situation massively difficult for much longer than necessary.