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The Effect of Hibiscus Sabdariffa L. Tea on Blood Pressure

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00175110
Recruitment Status : Completed
First Posted : September 15, 2005
Last Update Posted : December 3, 2009
Celestial Seasonings
Tufts Medical Center
Information provided by:
Tufts University

Brief Summary:
The goal of this study is to find out whether the plant compounds present in Hibiscus sabdariffa, a plant commonly used in herbal tea blends and other beverages, will have a beneficial effect on blood pressure in people with mildly elevated blood pressure.

Condition or disease Intervention/treatment Phase
Hypertension Behavioral: herbal therapy/botanical therapy (Hibiscus sabdariffa) Phase 1 Phase 2

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 66 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Treatment
Official Title: The Effect of Hibiscus Sabdariffa L. Tisane on Blood Pressure in Prehypertensive and Mildly Hypertensive Men and Women
Actual Primary Completion Date : December 2007
Actual Study Completion Date : December 2007

Resource links provided by the National Library of Medicine

Information from the National Library of Medicine

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Ages Eligible for Study:   30 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Systolic blood pressure 120-150 mm Hg
  • Diastolic blood pressure 95 mm Hg or less
  • Body mass index (BMI) 18.5-34.9 kg/m2

Exclusion Criteria:

  • Smoking
  • Use of medications that influence blood pressure
  • Cardiovascular disease
  • Chronic kidney disease
  • Diabetes
  • Regular use of vitamin C supplements (min 500 mg/day) within prior 30 days
  • Regular strenuous aerobic activity greater than 30 min/day
  • Excessive intake of caffeine or alcohol
  • Pregnancy within last 6 months or during study period
  • Abnormal complete blood count (CBC), urinalysis or electrocardiogram (EKG)

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00175110

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United States, Massachusetts
Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University
Boston, Massachusetts, United States, 02111
Sponsors and Collaborators
Tufts University
Celestial Seasonings
Tufts Medical Center
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Principal Investigator: Jeffrey B Blumberg, Ph.D. Tufts Medical Center
Additional Information:
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Jeffrey B. Blumberg, Tufts University Identifier: NCT00175110    
Other Study ID Numbers: PV3727
First Posted: September 15, 2005    Key Record Dates
Last Update Posted: December 3, 2009
Last Verified: December 2009
Keywords provided by Tufts University:
mild hypertension
Additional relevant MeSH terms:
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Vascular Diseases
Cardiovascular Diseases