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The Arthritis Research Center of Canada (ARC) has finished a six month double blind study that has shown no long term benifits of Glucosamine and chondroitin.
Also there has been a long term study of about two or three years called GAIT (Glucosamine/Chondroitin Arthritis Intervention Study) here in the USA that is being peer reviewed. I believe it might be the only true scientific study done besides the ARC study regarding these two supplements.
The EU has had studies that supposedly showed promising results however the doses used there are higher from what is used in American OTC doses. Also, no offense intended, at least one EU study has been discredited in the area of heart research recently.
Other problems with Glucosamine and Chondroitin are dose consistancy, label misrepresentation, and even impurities. Why it is that pharmaceuticals are held to such a high standard by the public yet these OTC's are not is beyond me.
On a personal level, as I type this, my wife who is a DC tells me that her subjective observations of her pt's are that neither of these two supplements are efficacious-
FWIW
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