Effect of vitamin D supplementation on blood pressure: a systematic review and meta-analysis incorporating individual patient data

Louise A. Beveridge, Allan D. Struthers, Faisel Khan, Rolf Jorde, Robert Scragg, Helen M. Macdonald, Jessica Alvarez, Rebecca Boxer, Andrea Dalbeni, Adam D. Gepner, Nicole M. Isbel, Thomas Larsen, Jitender Nagpal, William G. Petchey, Hans Stricker, Franziska Stroebel, Vin Tangpricha, Laura Toxqui, M. Pilar Vaquero, Louise WambergArmin Zittermann, Miles D. Witham, D-PRESSURE Collaboration

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    Abstract

    Importance
    Low levels of vitamin D are associated with elevated blood pressure (BP) and future cardiovascular events. Whether vitamin D supplementation reduces BP and which patient characteristics predict a response remain unclear.

    Objective
    To systematically review whether supplementation with vitamin D or its analogues reduce BP.

    Data Sources
    We searched MEDLINE, CINAHL, EMBASE, Cochrane Central Register of Controlled Trials, and http://www.ClinicalTrials.com augmented by a hand search of references from the included articles and previous reviews. Google was searched for gray literature (ie, material not published in recognized scientific journals). No language restrictions were applied. The search period spanned January 1, 1966, through March 31, 2014.

    Study Selection
    We included randomized placebo-controlled clinical trials that used vitamin D supplementation for a minimum of 4 weeks for any indication and reported BP data. Studies were included if they used active or inactive forms of vitamin D or vitamin D analogues. Cointerventions were permitted if identical in all treatment arms.

    Data Extraction and Synthesis
    We extracted data on baseline demographics, 25-hydroxyvitamin D levels, systolic and diastolic BP (SBP and DBP), and change in BP from baseline to the final follow-up. Individual patient data on age, sex, medication use, diabetes mellitus, baseline and follow-up BP, and 25-hydroxyvitamin D levels were requested from the authors of the included studies. For trial-level data, between-group differences in BP change were combined in a random-effects model. For individual patient data, between-group differences in BP at the final follow up, adjusted for baseline BP, were calculated before combining in a random-effects model.

    Main Outcomes and Measures
    Difference in SBP and DBP measured in an office setting.

    Results
    We included 46 trials (4541 participants) in the trial-level meta-analysis. Individual patient data were obtained for 27 trials (3092 participants). At the trial level, no effect of vitamin D supplementation was seen on SBP (effect size, 0.0 [95% CI, −0.8 to 0.8] mm Hg; P = .97; I2 = 21%) or DBP (effect size, −0.1 [95% CI, −0.6 to 0.5] mm Hg; P = .84; I2 = 20%). Similar results were found analyzing individual patient data for SBP (effect size, −0.5 [95% CI, −1.3 to 0.4] mm Hg; P = .27; I2 = 0%) and DBP (effect size, 0.2 [95% CI, −0.3 to 0.7] mm Hg; P = .38; I2 = 0%). Subgroup analysis did not reveal any baseline factor predictive of a better response to therapy.

    Conclusions and Relevance
    Vitamin D supplementation is ineffective as an agent for lowering BP and thus should not be used as an antihypertensive agent.
    Original languageEnglish
    Pages (from-to)745-754
    JournalJAMA Internal Medicine
    Volume175
    Issue number5
    Early online date16 Mar 2015
    DOIs
    Publication statusPublished - May 2015

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