I think that insulin used by diabetics was for a long time based on pig products (is now fully synthetic I think), and I think also heart valves have also been used from pigs for human transplants...from thinking back to my ag uni days (long time ago), pig organs (and so I'm guessing hormones) are not that far removed from humans...at one stage there was investigation of using pig organs (eg hearts/lungs) for transplant into humans due to the low number of organ donors. Of course we are talking about pigs bred specifically for the purpose under very specialised conditions etc. Not sure it ever went far due to the ethical considerations. So a lot of people (maybe more than we thought

) owe their lives to little piggies! ...oh and I think that there is a horse hormone used for some treatment of some other human illness...pregnant mare syrum I think it is called...and we use a by-product from milk in some toothpastes to strenghten teeth...as for the disease risk, animal by-products prob would have to face stronger disease testing and are specifically harvested under very controled conditions than say, your average backyard vegie patch where mice/snails/birds etc etc (oh add more to the list if you use animal manure to fertilise) have been...
Of course this is all from memory so take with the grain of salt it prob needs

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