Why perpetuate the false narrative that a chemical in food grade gel that is perfectly safe for human consumption is "horse paste"?

That seems irresponsible. Ivermectin is one of the best known and most widely used antiparasitic drugs in human and veterinary medicine. The story behind ivermectin's discovery is simple, unambiguous, and devoid of controversy.

"One culture, derived from a soil sample collected near a golf course southwest of Tokyo, was remarkably effective against worms. The bacterium in the culture was a new species, and was baptised Streptomyces avermictilis. The active component, named avermectin, was chemically modified to increase its activity and its safety. The new compound, called ivermectin, was commercialised as a product for animal health in 1981 and soon became a top-selling veterinary drug in the world. Remarkably, despite decades of searching, S. avermictilis remains the only source of avermectin ever found."