There are numerous conflicting studies regarding the efficacy of glucosamine in treating joint conditions. However, a recent meta-analysis (i.e. a study of studies) by the British Medical Journal suggests that it is no better than placebo for alleviating joint pain or for narrowing of joint spacing:
> Compared with placebo, glucosamine, chondroitin, and their combination do not reduce joint pain or have an impact on narrowing of joint space. Health authorities and health insurers should not cover the costs of these preparations, and new prescriptions to patients who have not received treatment should be discouraged.