The Effect of Hibiscus Sabdariffa L. Tea on Blood Pressure

The Effect of Hibiscus Sabdariffa L. Tisane on Blood Pressure in Prehypertensive and Mildly Hypertensive Men and Women

Status

Completed

Phases

Phase 1Phase 2

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT00175110

Enrollment

Registered

2005-09-15

Start date

Unknown

Completion date

2007-12-31

Last updated

2009-12-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Hypertension

Keywords

pre-hypertension, mild hypertension

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.

Interventions

BEHAVIORALherbal therapy/botanical therapy (Hibiscus sabdariffa)

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

DOUBLE (Subject, Investigator)

Eligibility

Sex/Gender

ALL

Age

30 Years to 70 Years

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)

Countries

United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026