We have been using this product on our 110 lb. Lab for 5 years. He has two arthritic hocks and they give him a lot of pain when we run out of his recovery. If he stays on the product, he is one big 7 year old puppy.
I have a 12 yr old collie that acts like a pup on the Recovery SA, if I run out for even just a few days, she slows down dramatically. Back on it, she's frisky again! To me, that's proof that is works for her. So I also have my other 3 dogs on Recovery SA and they will stay on it for life!