Not sure if it works, but they find it disgusting
I've tried to disguise it with food, treats, and even giving it to them all at once. There are some bad things, like the fact that it's a lot of millilitres for a single dose, which means the cat has time to spit it out and run off. It's not palatable at all—maybe a dog would take it, but I really doubt a cat would. I've given it to two of my cats: one of them was already expecting it, but the other, who usually eats anything, threw it up like it was the most disgusting thing he'd ever tasted.