Not for cats, but it's done wonders for my dog with bad arthritis. It's a powerful anti-inflammatory, but safe for animals with liver disease. With the addition of Duralactin, within a couple of months she was able to go off her regular pain medication. She just had emergency surgery for a gall bladder problem that was affecting her liver, and her doctors told us it was absolutely fine to keep giving her the Duralactin (but not painkillers). It's been a great addition to her treatment, and we're really pleased with it.
HTH!