The effects of multivitamins on cognitive performance: a systematic review and meta-analysis

Journal of Alzheimer's Disease : JAD
Natalie A GrimaAndrew Pipingas

Abstract

Complementary medicine use is becoming increasingly popular with multivitamins being the most commonly used vitamin supplement. Although adequate vitamin and nutrient concentrations are necessary for optimal health and cognitive functioning, there is no scientific consensus as to whether multivitamin use prevents cognitive decline or improves mental functioning. The aim of the present study was to determine if multivitamins can be used efficaciously to improve cognitive abilities. A systematic review of randomized controlled trials was performed. Meta-analysis was performed on those cognitive tests used across the largest number of studies. Multiple electronic databases were searched until July 2011 by two authors. Randomized, placebo-controlled trials were considered appropriate if they reported on the chronic effects (≥1 month) of oral multivitamin supplementation on any valid cognitive outcomes. Ten trials were included in review (n = 3,200). Meta-analysis indicated that multivitamins were effective in improving immediate free recall memory (SMD = 0.32; 95% CI: 0.09-0.56, p < 0.01) but not delayed free recall memory (SMD = -0.14; 95% CI: -0.43-0.14, p = 0.33) or verbal fluency (SMD = 0.06; 95% CI: -0.05-0.18, p = 0.26). Ther...Continue Reading

Citations

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