Have you checked the reviews on Amazon? Quite a few there. From the one I glanced at, it appears there is not enough glucosamine in the formulation to be effective. I take calcium citrate and glucosamine chondroitin from Sam's Club, and that combo has stopped my knees from getting worse for 10+ years. (Only wish someone had told me to start taking it as soon as my knees started giving me problems!)
It may depend too on the cause of the joint pain. My pain is due to osteoarthritis. For rheumatoid arthritis joint pain, something else might be needed.
My 94yo mil said that this cream I sent her (Mobisyl) helps her joint pain:
http://www.amazon.com/gp/product/B00008WFLP
(I read about Mobisyl on this QB!)