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Runhaar and colleagues1 produced an elegant meta-analysis of various glucosamine-containing products in knee and hip osteoarthritis (OA), based on individual patient data (IPD). Although they were able to access and analyse only 5 out 21 eligible studies, their results are in agreement with most glucosamine meta-analyses in OA: glucosamine products other than prescription crystalline glucosamine sulfate are not effective in hip or knee OA pain and function.
Such results, as acknowledged by the Authors, had already been demonstrated in several previous and more comprehensive meta-analyses, including a dedicated Cochrane Review2 and a recent effort by Eriksen et al 3 specifically investigating possible differences in efficacy among glucosamine products. Indeed, glucosamine exists in different forms for pharmaceutical use, as extensively reviewed by Altman.4 Among these, glucosamine hydrochloride (used in three out of …
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