I've actually done some research on the inactive ingredients in horse ivermectin. It's in a post from yesterday in response to what I perceived to be concern trolling. From what I recall, the ingredients included, apple flavoring, polysorbate and aerosil, which is used in things like cake mixes and spices (for human consumption), to keep them from clumping. Of course I don't know what each and every brand has in it, but that was generally what they contained.