Our Chloe went from acting like an old dog that no longer wanted to participate to being a puppy again at nine years old! She had reached the point where we bought her a special bed for the floor as she could no longer jump up onto the couch with the other dogs. Now, she springs upon the couch as she did in years gone by. This is the first and only product that we could actually “see” the progress – immediately. She is doing so well that I would not consider stopping the GlycanAid HA for even a day!