The only argument about the human formulation is that there still doesn't appear to be any particular reason for you to take it. Why not get the vaccine, which is actually proven to work?
Ivermectin is not a miracle cure being pushed aside because it's cheap and readily available. Merck makes ivermectin for humans. They don't make a vaccine or expensive therapeutic for Covid. If there were sufficient evidence to market ivermectin as a therapy/prevention for Covid, they'd be all over it. If there were even a realistic hint that it worked, Merck would fund the research to prove it.