Well..for one thing, cats fed an appropriate diet don't need extra hydration, they get it from their food, as nature designed them to do.
That website doesn't mention what the OTHER ingredients are, only the "therapeutic" ingredients. Why is that, I wonder?
But don't worry, if the idea takes off for dog lovers, it won't take them long to make one for cats, too.
I know I sound like a chronic skeptic. But that's because I am. I am suspicious of just about every "made for pets" supplement out there these days. Pet supplements are big business and big business means lets see how cheaply we can make this product. Even the stuff Dr Becker sells for pets on her Mercola site always has at least one thing in them that would prevent me from ever using them.
Her digestive enzymes, for example contain cellulose. When I wrote and asked what they mean by cellulose I was told that it comes from "tree roots".