Glucosamine, chondroitin sulfate, and the two in combination for painful knee osteoarthritis.
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Link to full study
http://www.ncbi.nlm.nih.gov/pubmed/16495392
Conclusion of this study
Glucosamine and chondroitin sulfate alone or in combination did not reduce pain effectively in the overall group of patients with osteoarthritis of the knee. Exploratory analyses suggest that the combination of glucosamine and chondroitin sulfate may be effective in the subgroup of patients with moderate-to-severe knee pain. (ClinicalTrials.gov number, NCT00032890.).
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