good idea - if your cat will eat them. mine won't.
my cat has refused these straight from the bag, hidden in his dry food and broken into halves in his wet food. in order not to waste them i've resorted to crumbling them up into dust in his wet food and that seems to work but will he still see the benefits? too soon to tell. he's an indoor cat that won't go near the real grass i grew for him so it's on to plan B for hairball prevention i think.