I really can not say enough about this product. It was recommended by our vet for my 2 dogs who are getting up their in age, and having mobility issues. I have had them both, my male, Great Dane/Pitbull, 9 years old, 164 pounds, and my female Pitbul/Labrador, 70 pounds on this for a little over 10 months. I didn't notice much change at first. It was my neighbor who said to me (after about 6 months into giving this to them), what are you giving to these two? Are you taking them swimming in a fountain of youth? They have been running around like puppies, playing and having fun. And he was right. I'm not really sure what I expected. It almost seems like they have gone back in time a couple years. I have never written a review about anything before. This time I had too. I love my babies so much, andanything that I feel will give me a little more time wit them, I am in. As great as this product, is the customer service. It is THE BEST!!! I have called a couple of times, with questions about my auto ship order, and they were so great, both times To me, that was the icing on the cake. Customer service is a lost art these days. But not with this company. I would recommend this company/product to anyone. My babies, and myself are better because of them!