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lüll A systematic review of vanadium oral supplements for glycaemic control in type 2 diabetes mellitus Smith DM; Pickering RM; Lewith GTQJM 2008[May]; 101 (5): 351-8OBJECTIVE: To assess the effectiveness of oral vanadium supplementation for glycaemic control in type 2 diabetes by conducting a systematic review of the literature. DESIGN AND METHODS: Eligible studies were identified by searching 14 databases using standardized terms. Experts, study authors and manufacturers were also contacted. Hand-searching was not undertaken. Selection criteria for inclusion in the review were controlled human trials of vanadium vs. placebo in adults with type 2 diabetes of minimum 2 months duration, and a minimum of 10 subjects per arm. Data extraction, assessment of study quality and outcome analysis were undertaken by two independent reviewers. RESULTS: One hundred and fifty one studies were found but none met the inclusion criteria. We proceeded to summarize the state of existing evidence and plan for a future clinical trial by applying revised, less restrictive criteria to our search, for clinical trials of 30-150 mg daily oral vanadium supplementation in diabetic humans. Only five were identified. These demonstrated significant treatment-effects, but due to poor study quality, must be interpreted with caution. Treatment with vanadium often results in gastrointestinal side-effects. CONCLUSION: There is no rigorous evidence that oral vanadium supplementation improves glycaemic control in type 2 diabetes. The routine use of vanadium for this purpose cannot be recommended. A large-scale randomized controlled trial is needed to address this clinical question.|*Dietary Supplements[MESH]|Administration, Oral[MESH]|Blood Glucose[MESH]|Clinical Trials as Topic[MESH]|Diabetes Mellitus, Type 2/*drug therapy[MESH]|Humans[MESH]|Hypoglycemic Agents/*administration & dosage[MESH]|Trace Elements/*administration & dosage[MESH]|Vanadium/*administration & dosage[MESH] |