Good but too expensive
My cat has chronic cystitis due to anxiety and these really help, but you have to give them... like, forever. I stopped and started giving her one a week, and she got cystitis again. The price is VERY expensive. If this company really wanted to help suffering poor kitties—since cystitis is very painful—they would lower the price (or Zooplus would). But yes, they do work, but they're also overpriced.