and good day to you .Sir .
when the space program started a few years back 2000 poss
i was told some insulin s , modified by space tech , would be more PURE and give a steady release and steady control .
and i think over the years they are correct.
I also believe that some animal insulins are becoming very difficult to obtain like i think pork are on the demise
sorry can not tell , why .
but maybe somebody on the forum can help
regards Vic 50/60 medal insulin man ....