I use this for my 18 year old cat. My vet prescribed it. My cat has a lot of trouble with his back and a bad disk. This seems to help. After taking it, he seems to get around a little better. I noticed also that his coat looks better. It is half the price of what I pay at my vet, so I am overall pleased with the product. It came quickly, was packaged well, and is the same exact thing my vet gave me. Will be repurchasing.