I have been using it for the past four years for a knee injury which went back a few years prior. Two years ago I had reconstructive surgery done on my right knee, the one with the problem, do to a then recent hockey injury. After the surgery, I stopped for a while and definitely notice the pain returning. I still take one pill a day and have very little discomfort. It works for me!

Tom
'82 Sd
'86 SDL