We've been giving it to Max for the last couple months (since the arthritis diagnosis) along with Springtime joint health and it seems to be helping. He's no puppy again, but a definite improvement. Last week when he was at the groomer, he could still get around enough to go to the petstore afterwards and wasn't so stiff the next day that he needed help getting up. In fact, he had practically no trouble the next day.
As long as this works for him, it means we can keep him off the prescriptions.