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. 2024 Jan 30;14(1):e074511.
doi: 10.1136/bmjopen-2023-074511.

Effect of vitamin B2, vitamin C, vitamin D, vitamin E and folic acid in adults with essential hypertension: a systematic review and network meta-analysis

Shangwen Qi  1 , Xu Luo  2 , Shuangfang Liu  1 , Bishi Ling  1 , Meilong Si  1 , Hua Jin  3
Affiliations

Effect of vitamin B2, vitamin C, vitamin D, vitamin E and folic acid in adults with essential hypertension: a systematic review and network meta-analysis

Shangwen Qi et al. BMJ Open. .

Abstract

Objectives: The objective of the current study is to compare the treatment effects of different vitamins on essential hypertension to provide an initial basis for developing evidence-based practices.

Design: Systematic review and network meta-analysis.

Data sources: Five electronic databases (PubMed, Embase, Web of Science, Cochrane Central Register of Controlled Trials and ClinicalTrials.gov) were searched from their inception to 25 September 2023.

Outcomes: The primary outcomes were the difference between the intervention group and the control group in changes in office systolic blood pressure (SBP) and office diastolic blood pressure (DBP) from baseline. The secondary outcomes were the difference between the intervention group and the control group in changes in 24-hour mean ambulatory systolic blood pressure (24 hours SBP), 24-hour mean ambulatory diastolic blood pressure (24 hours DBP) and heart rate (HR) from baseline.

Results: A total of 23 studies comparing five vitamins (vitamin B2, vitamin C, vitamin D, vitamin E, folic acid) and involving 2218 participants were included. The included trials were all vitamin versus placebo, so the network was star-shaped. Among the five vitamins, only vitamin E was significantly more effective at reducing SBP (mean difference: -14.14 mm Hg, 95% credible intervals: -27.62 to -0.88) than placebo. In addition, no evidence was found that any of the five vitamins influenced DBP, 24 hours SBP, 24 hours DBP, or HR. The dose of vitamins, geographical region and percentage of males (only SBP) might be sources of heterogeneity. Sensitivity and subgroup analysis revealed that the effect of vitamin intervention on blood pressure varies according to different doses of vitamins.

Conclusions: According to the results, vitamin E might be an effective measure to reduce SBP, but more research is needed to validate this finding.

Prospero registration number: CRD42022352332.

Keywords: Blood Pressure; Hypertension; NUTRITION & DIETETICS.

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Conflict of interest statement

Competing interests: None declared.

Figures

Figure 1
Figure 1
Flow diagram of the study selection process for this network meta-analysis.EH, essential hypertension; RCT, randomised controlled trial.
Figure 2
Figure 2
Evidence network of SBP and DBP in the meta-analysis. DBP, office diastolic blood pressure; FA, folic acid; Pla, placebo; SBP, office systolic blood pressure; Vit B2, vitamin B2; Vit C, vitamin C; Vit D, vitamin D; Vit E, vitamin E.
See this image and copyright information in PMC

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