Have been using this product on my 5 year old golden lab for 4weeks now. He suffers from arthritis in his hind hock and limps at night after exercise. Although we still have to be careful not to over exercise the swelling seems to be reduced and he seems to be a lot more full of beans. Maybe it's just wishful thinking and it's working as a placebo on me but others have noticed a change in him too! I'll be continuing to use this and would encourage any other people in this situation to give it a try.