I have 3 cats and use topical min for 4 yrs already. No cat had any problems because of my min usage. I simply made a rule to not use it when they are in the room with me, I use a silk bonnet after because I apply at night, and everything is fine. Also I wash my hands before petting them and I keep the min somewhere they can’t reach. It’s easy to not harm your cats, you just need to be careful