I know a wealthy guy that created several supplement companies years ago, etc. and has a pharmacist buddy that he has make ivermectin human-grade. That is the problem with "vet" products--their products have an added substance to stop humans from consumption. They also do it to turpentine. Vet Lugol'sIodine has a non human ingredient and he said the pharmacist said the farm store ivermectin not good for human use. So a pharmacist can make the same thing--minus the toxic ingredient.
Medical / scientist were probably not so evil pre 1900, after world war 1, they had little choice if they wanted the easy/free college $$