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Related Experiment Video

Updated: Jun 10, 2026

Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro
12:00

Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro

Published on: July 5, 2017

Grape polyphenols do not affect vascular function in healthy men.

Linda A J van Mierlo1, Peter L Zock, Henk C M van der Knaap

  • 1Unilever Research and Development, Vlaardingen 3133 AT, The Netherlands. linda-van.mierlo@unilever.com

The Journal of Nutrition
|August 13, 2010
PubMed
Summary

Grape polyphenols from wine or seeds did not significantly improve endothelial function (flow-mediated dilation) in healthy men. Further research is needed for at-risk populations to assess cardiovascular benefits.

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Published on: April 22, 2022

Area of Science:

  • Cardiovascular Health
  • Nutritional Science
  • Endothelial Function

Background:

  • Polyphenol-rich foods, like grapes and wine, are linked to improved cardiovascular health.
  • The isolated effects of grape polyphenols on vascular function require further investigation in controlled studies.

Purpose of the Study:

  • To evaluate the chronic impact of wine grape mix and grape seed polyphenols on flow-mediated dilation (FMD) in healthy males.
  • To assess secondary outcomes including blood pressure, vascular function, platelet function, and blood lipids.

Main Methods:

  • A double-blind, placebo-controlled, crossover study involving 35 healthy males.
  • Three 2-week intervention periods with 800 mg of polyphenols from grape solids (wine grape mix or grape seed) or placebo, separated by 1-week washout periods.
  • Measurements of FMD, blood pressure, and other vascular markers were taken after standardized low-fat and high-fat meals.

Main Results:

  • No significant differences in FMD were observed after consuming wine grape or grape seed polyphenols compared to placebo, following a low-fat breakfast.
  • Effects on FMD after a high-fat lunch and secondary vascular outcomes also showed no consistent improvements with grape polyphenol treatments.
  • The study found no major impact of grape polyphenol consumption on FMD in healthy men.

Conclusions:

  • Consumption of isolated grape polyphenols from wine grape mix or grape seed does not significantly enhance endothelial function in healthy males.
  • Future research should explore the efficacy of grape polyphenols in populations with elevated cardiovascular risk.
  • Grape polyphenols may not be a primary intervention for improving FMD in generally healthy individuals.