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

2014-08-27 03:19:13 | BioPortfolio


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).


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:

1. The primary objective of the proposed study is to demonstrate the effectiveness of GSE to lower blood pressure in pre-hypertensive individuals.

2. Secondary objectives will investigate the role of GSE to improve inflammatory- and oxidative stress- status, as well as its effect on endothelium function.

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Investigator), Primary Purpose: Treatment




grape seed extract, grape seed extract placebo


Clinical Nutrition Research Center
United States




National Center for Food Safety and Technology

Results (where available)

View Results


Published on BioPortfolio: 2014-08-27T03:19:13-0400

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Medical and Biotech [MESH] Definitions

Exudate from seeds of the grape plant Vitis vinifera, composed of oils and secondary plant metabolites (BIOFLAVONOIDS and polyphenols) credited with important medicinal properties.

A dehydrated extract of thyroid glands. After the removal of fat and connective tissue, the extract is dried or lyophilized to yield a yellowish to buff-colored amorphous powder containing 0.17-0.23% of iodine.

A plant genus in the family BERBERIDACEAE. The common names of Barberry or Oregon Grape are also used for MAHONIA. The similar-named Bayberry is the unrelated MYRICA. Oregon Grape was classified by Pursh as a Berberis but Nuttall claimed it is different enough to call it a new genus, MAHONIA. Botanists insist on this name while horticulturists stay with Mahonia. They are shrubs with yellow wood and usually three-branched spines at the base of leafstalks. Flowers are yellow, six-petaled and fruit is a berry with one to several seeds. Members contain BERBERINE.

A dehydrated extract of thyroid glands from domesticated animals. After the removal of fat and connective tissue, the extract is dried or lyophilized to yield a yellowish to buff-colored amorphous powder containing 0.17-0.23% of iodine.

One or more types of plant seed proteins providing the large amounts of AMINO ACIDS utilized in GERMINATION and SEEDLING growth. As seeds are the major food source from AGRICULTURAL CROPS, seed storage proteins are a major source of DIETARY PROTEINS.

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