I started using this a few times a week and our cats have significantly reduced the number of times they throw up hairballs. It's great for humans as now we have much less (not-so-fun) cleaning to do!
My cat kept retching but bringing nothing up. Decided to try this and two weeks later she brought up two hairballs. She's so much better. Will use all the time. And will be ordering a bigger bag. I would highly recommend.
I bought this to try as my cat, Jess, is often sick, bringing up large hairballs, especially at the start of summer. She was only sick once while she was eating this - result! I need to get a bigger bag now as she has started being sick again since going back to her other food.