Assertion: glucosamine's formulation | /r/CapableOf | display effectiveness
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text: Great-scale research has shown that the use of different commercial brands could factor into results, as suggested by Towheed et al. , in their meta-analysis of over 20 randomized controlled trials; only formulations of glucosamine sulfate manufactured by Rotta Laboratories displayed effectiveness in the symptomatic management of patients with OA of the knee, while with other presentations, no statistically significant results were obtained.