Effectiveness of vitamin-B supplements on cognition in older adults: A meta-analysis

The search of electronic engines yielded 2294 records; 490 of them were retrieved with the restriction of the search to clinical trials. After the removal of duplicates and irrelevant studies, 23 articles were selected for inclusion in this meta-analysis. Fig. 1 illustrates the search strategy and selection of articles for meta-analysis.24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46

Table 2 summarizes the 23 randomized-controlled trials. The sample

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