Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Hypertension/High Blood Pressure Health Center

Font Size

Grape Seed Extract for Blood Pressure?

Study: Grape Seed Extract May Help Tame Prehypertension
WebMD Health News
Reviewed by Louise Chang, MD

March 27, 2006 -- Grape seed extract might help control blood pressure, a new study shows.

The news comes from scientists at the University of California at Davis. They studied 24 adults with metabolic syndrome, a cluster of abnormalities that raises the risk of diabetes and heart disease.

Most participants had prehypertension; the others had normal blood pressure. Prehypertension falls between normal and high blood pressure.

Participants were split into three groups. One group got a fake (placebo) treatment. Another group took 150 milligrams per day of grape seed extract. The third group took 300 milligrams daily of the same grape seed extract.

Four weeks later, blood pressure had dropped for those taking grape seed extract. Blood pressure didn't change in the placebo group.

The findings were presented in Atlanta at the American Chemical Society's National Meeting & Exposition.

Blood Pressure Effects

The two extract doses were "equally efficient in lowering the blood pressure," researcher C. Tissa Kappagoda, MD, PhD, tells WebMD. Kappagoda specializes in cardiovascular medicine at the University of California at Davis.

Systolic blood pressure (the top number in a blood pressure reading) dropped 12 points, on average. Diastolic blood pressure (the bottom number in a blood pressure reading) dropped an average of 8 points, Kappagoda says.

The blood pressure changes were seen "across the board," not just in people with prehypertension, says Kappagoda. He notes that his team had already done preliminary work on people with normal blood pressure and found no dangerous drop in blood pressure with grape seed extract.

Kappagoda and colleagues had previously found that grape seed extract might help dilate blood vessels. "Because of that, we thought it had potential as a blood-pressure-lowering agent," Kappagoda says.

In Kappagoda's latest study, LDL "bad" cholesterol levels also fell in people taking the higher extract dose, but not in those taking the lower dose.

Talk to Doctor First

Grape seed extract isn't marketed with any health claims, Kappagoda points out.

He says people who are thinking about taking grape seed extract should consult their doctors. Kappagoda also says he "wouldn't want to recommend" that anyone stop taking medicine for high blood pressure in favor of grape seed extract.

"But on the other hand, if their physicians have said, 'You know, you're kind of borderline,' and so on, then there may be some place for this after consulting their physician," Kappagoda says, pointing out that doctors usually recommend lifestyle change -- not prescription drugs -- to treat prehypertension.

The study was funded by the extract's maker, Polyphenolics Inc.

Today on WebMD

blood pressure
Symptoms, causes, and more.
Learn the causes.
Compressed heart
5 habits to change.
Mature man floating in pool, goggles on head
Exercises that help.
heart healthy living
Erectile Dysfunction Slideshow
Bernstein Hypertension Affects Cardiac Risk
Compressed heart
Heart Disease Overview Slideshow
thumbnail for lowering choloesterol slideshow
Heart Foods Slideshow
Low Blood Pressure