" Can anyone please share a resource that demonstrates that horse / animal-labeled ivermectin is safe for humans?"

NO. You have to do your own research. People will not produce this information because any source could be used for lawfare enforcement by the eFF-Bee-eYe. Start by reading the ingredients on the label. Then calculate the ratio for human use. People will recommend the brand names to use, but I highly doubt your question is going to be answered.

" Can anyone please share a resource that demonstrates that horse / animal-labeled ivermectin is safe for humans?"

NO. You have to do your own research. People will not produce this information because any source could be used for lawfare enforcement by the eFF-Bee-eYe. Start by reading the ingredients on the label. Then calculate the ratio for human use. People will recommend the brand names to use, but I highly doubt your question is going to be answered.