We have been using this supplement for several years - for a dog who is thirteen now and has had arthritis since he was 9, and for a dog we adopted 2 years ago at 5 whose fractured front leg had never been treated properly and who also had some hip problems. We really think this product helps them have less pain and move more freely - so much so that we recommended it to a friend whose older dog was starting to have joint problems.  She is on a limited budget but she sees enough improvement in her boy that she has continued giving this supplement. Our vet says he has had similar reports from other patient's caregivers.  If you look around on Amazon, you can usually find a supplier with a decent price for the 650 gram container.