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Efficacy of Supplementation with B Vitamins for Stroke Prevention: A Network Meta-Analysis of Randomized Controlled Trials

Author

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  • Hongli Dong
  • Fuhua Pi
  • Zan Ding
  • Wei Chen
  • Shaojie Pang
  • Wenya Dong
  • Qingying Zhang

Abstract

Background: Supplementation with B vitamins for stroke prevention has been evaluated over the years, but which combination of B vitamins is optimal for stroke prevention is unclear. We performed a network meta-analysis to assess the impact of different combinations of B vitamins on risk of stroke. Methods: A total of 17 trials (86 393 patients) comparing 7 treatment strategies and placebo were included. A network meta-analysis combined all available direct and indirect treatment comparisons to evaluate the efficacy of B vitamin supplementation for all interventions. Results: B vitamin supplementation was associated with reduced risk of stroke and cerebral hemorrhage. The risk of stroke was lower with folic acid plus vitamin B6 as compared with folic acid plus vitamin B12 and was lower with folic acid plus vitamin B6 plus vitamin B12 as compared with placebo or folic acid plus vitamin B12. The treatments ranked in order of efficacy for stroke, from higher to lower, were folic acid plus vitamin B6 > folic acid > folic acid plus vitamin B6 plus vitamin B12 > vitamin B6 plus vitamin B12 > niacin > vitamin B6 > placebo > folic acid plus vitamin B12. Conclusions: B vitamin supplementation was associated with reduced risk of stroke; different B vitamins and their combined treatments had different efficacy on stroke prevention. Folic acid plus vitamin B6 might be the optimal therapy for stroke prevention. Folic acid and vitamin B6 were both valuable for stroke prevention. The efficacy of vitamin B12 remains to be studied.

Suggested Citation

  • Hongli Dong & Fuhua Pi & Zan Ding & Wei Chen & Shaojie Pang & Wenya Dong & Qingying Zhang, 2015. "Efficacy of Supplementation with B Vitamins for Stroke Prevention: A Network Meta-Analysis of Randomized Controlled Trials," PLOS ONE, Public Library of Science, vol. 10(9), pages 1-12, September.
    • Handle: RePEc:plo:pone00:0137533
    DOI: 10.1371/journal.pone.0137533
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    References listed on IDEAS

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    1. David J. Spiegelhalter & Nicola G. Best & Bradley P. Carlin & Angelika Van Der Linde, 2002. "Bayesian measures of model complexity and fit," Journal of the Royal Statistical Society Series B, Royal Statistical Society, vol. 64(4), pages 583-639, October.
    2. Chi Zhang & Feng-Ling Chi & Tian-Hao Xie & Yu-Hao Zhou, 2013. "Effect of B-vitamin Supplementation on Stroke: a Meta-Analysis of Randomized Controlled Trials," PLOS ONE, Public Library of Science, vol. 8(11), pages 1-1, November.
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