The Effects of Quercetin Supplementation on Blood Pressures and Endothelial Function Among Patients with Metabolic Syndrome and Related Disorders: A Systematic Review and Meta-analysis of Randomized Controlled Trials

Curr Pharm Des. 2019;25(12):1372-1384. doi: 10.2174/1381612825666190513095352.

Abstract

Background: This systematic review and meta-analysis of randomized controlled trials (RCTs) were performed to determine the effect of quercetin administration on blood pressures and endothelial function among patients with metabolic syndrome (MetS) and related disorders.

Methods: We searched systematically online databases including Cochrane Library, EMBASE, MEDLINE, and Web of Science to identify the relevant RCTs until December 2018. Q-test and I2 statistics were applied to assess heterogeneity among the included studies. Data were pooled using a random-effects model and weighted mean difference (WMD) was considered as the overall effect size.

Results: Out of 284 citations, 8 RCTs were included in the meta-analysis. We found a significant reduction in systolic blood pressure (SBP) (WMD: -1.69; 95% CI: -3.22, -0.17) following the intake of quercetin supplements. However, quercetin supplementation did not significantly affect diastolic blood pressure (DBP) (WMD: -3.14; 95% CI: -8.24, 1.95), vascular cell adhesion molecule 1 (VCAM-1) (WMD: -24.49; 95% CI: -53.74, 4.77) and intercellular adhesion molecule 1 (ICAM-1) (WMD: -5.78; 95% CI: -12.93, 1.38).

Conclusion: In summary, the current meta-analysis demonstrated that quercetin supplementation significantly reduced SBP, yet did not affect DBP, VCAM-1 and ICAM-1 among patients with MetS and related disorders.

Keywords: Quercetin; blood pressures; endothelial function; meta-analysis; metabolic syndrome; randomized controlled trials..

Publication types

  • Meta-Analysis
  • Research Support, Non-U.S. Gov't
  • Systematic Review

MeSH terms

  • Blood Pressure / drug effects*
  • Dietary Supplements*
  • Endothelium, Vascular / drug effects*
  • Humans
  • Intercellular Adhesion Molecule-1 / metabolism
  • Metabolic Syndrome / drug therapy*
  • Quercetin / therapeutic use*
  • Randomized Controlled Trials as Topic
  • Vascular Cell Adhesion Molecule-1 / metabolism

Substances

  • ICAM1 protein, human
  • Vascular Cell Adhesion Molecule-1
  • Intercellular Adhesion Molecule-1
  • Quercetin