Skip to main content
OpenTrials
Completed

NCT Number: NCT00979732

The Effect of Grape Seed Extract on Blood Pressure in People With Pre-Hypertension

In this research study, the investigators are interested in learning how extracts from grape seeds can help those individuals with high blood pressure. The investigators also hope to learn how grape seed extract effects your blood and cell functions.

The grape seed extract the investigators will use in the study will be provided either in a beverage or a capsule form and is currently available on the market. This study is also using a placebo; therefore the treatment subjects receive may or may not contain the grape seed extract.

The purpose of this study is to determine if the grape seed extract (GSE) will lower blood pressure in people with slightly high blood pressure (Pre-Hypertension).

Completed

Looking for future studies?

Notify Me

Key information

Conditions

Hypertension Cardiovascular Diseases Vascular Diseases

Age range

25 year–65 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Clinical Nutrition Research Center

Chicago, Illinois, 60616, United States

About this study

Elevated blood pressure, or hypertension, is a major risk factor for heart disease and stroke. Systolic and diastolic blood pressures meeting criteria for "pre-hypertension" double the absolute risk of stroke and ischemic heart disease over an extended age range from the 4th to the 8th decade of life. Lifestyle, particularly the diet, is critical in the prevention and management of hypertension. Polyphenolic compounds from various plant foods can promote blood pressure regulation and vascular health through protection of the endothelium from oxidant and or inflammatory stress and or stimulation of smooth muscle relaxation.

We will use a purified grape seed extract (GSE) in the proposed trial. This extract has been granted Generally Recognized as Safe (GRAS) status by Food and drug administration (GRAS Notice # GRN 000125, dated 08/18/2003, FDA, USA). Furthermore, GSE for use in the present trial has been used in previous human clinical trails and shown potent vasodilator properties in vitro and blood pressure lowering in metabolic syndrome patients. The proposed trial aims to verify the blood pressure lowering effect of GSE in an 'at risk' population for hypertension and to explore the extent to which other pathways of chronic disease may be modulated by GSE consumption.

Given this, the objectives of this study are as follows:

  • The primary objective of the proposed study is to demonstrate the effectiveness of GSE to lower blood pressure in pre-hypertensive individuals.
  • Secondary objectives will investigate the role of GSE to improve inflammatory- and oxidative stress- status, as well as its effect on endothelium function.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • male and female
  • pre-hypertensive
  • systolic blood pressure (mmHg) 120 - 139 or
  • diastolic blood pressure (mmHg) 80 -89
  • no clinical evidence of cardiovascular, respiratory, renal, gastrointestinal or hepatic disease

Exclusion criteria

  • pregnant and or lactating
  • taking over the counter antioxidant supplements
  • taking prescription medications that may interfere with study procedures or endpoints
  • unusual dietary habits
  • actively trying to lose or gain weight
  • addicted to drugs and/or alcohol
  • medically documented psychiatric or neurological disturbances
  • smoker (past smoker may be allowed if cessation is > 2 years)

Treatment and study plan

Grape seed extract

Dietary Supplement

grape seed extract 150 mg twice a day (BID) in beverage or capsule form

grape seed extract placebo

Dietary Supplement

grape seed extract 150 mg twice a day (BID) in beverage or capsule form

Primary outcomes

  1. Systolic Blood Pressure

    Time frame: 6 weeks

    BP was monitored using ambulatory BP monitors (Ambulo2400; Tiba Medical, Inc.) that were programmed to take BP measurements automatically at 1-h intervals for a period of 24 h. BP measurements were scheduled at week 0 and 6 of the intervention (for efficacy assessment). Day-time BP and night-time BP were divided based on the subject's sleeping hours and hours awake.

Secondary outcomes

  1. Plasma Insulin Level Over 6 Weeks

    Time frame: 6 weeks

    After 10-12 h of overnight fasting, fasting blood samples were collected at week 0 (baseline) and week 3 and 6 of the intervention. plasma insulin were evaluated.

Sponsors and collaborators

Lead sponsor

Clinical Nutrition Research Center, Illinois Institute of Technology

Industry

Collaborators

  • Polyphenolics, Inc.

Registry information

Official study title

Randomized, Double-blind, Placebo-controlled Trial to Investigate the Effect of Grape Seed Extract Delivered in a Beverage on Blood Pressure in Individuals With Pre-hypertension.

Acronym: GSE

Important dates

Study start
2009
Primary completion
2014
Study completion
2014
First posted
Sep 18, 2009
Registry last updated
Feb 11, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Related clinical trials

Published trials that share one or more normalized conditions with this study.