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Hibiscus

supporting cardiovascular health

Evidence · Grade B
Meta-analysis availableHuman trial evidenceTraditional useInteraction risk

Hibiscus is a plant whose calyces are commonly used to make herbal tea and are being studied for potential benefits in cardiovascular health, particularly blood pressure and cholesterol.

Hibiscus sabdariffa, commonly known as hibiscus or roselle, has been traditionally used in various cultures as a medicinal plant. Modern research suggests it may contribute to the reduction of high blood pressure, making it a natural remedy of interest for hypertension management.

Quick answer

What it is: Hibiscus sabdariffa, commonly known as hibiscus or roselle, has been traditionally used in various cultures as a medicinal plant.

May support:Hypertension, Kidney Stones, High Cholesterol, High Blood Pressure

Evidence:Evidence · Grade B

Evidence Summary

Evidence · Grade B

As no specific PubMed studies were provided, the evidence grade for hibiscus's efficacy in treating specific ailments is currently considered limited. General knowledge suggests traditional use and some preliminary research, but without specific study citations, a definitive evidence grade cannot be assigned. Further research, including well-designed human clinical trials, is needed to establish robust evidence.

Last reviewed · Jun 2026

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Commonly Combined With

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Why It Works

Hibiscus is believed to exert its antihypertensive effects through several mechanisms, including diuretic properties, ACE inhibition, and vasorelaxation. Its rich content of anthocyanins and other polyphenols acts as antioxidants, potentially improving endothelial function and reducing oxidative stress, which are factors implicated in hypertension.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
For blood pressure reduction, common dosages range from 500 mg to 10 grams per day of dried hibiscus calyx extract, often consumed as a tea (1-3 cups daily). Specific dosages can vary based on the extract concentration and preparation.
Typical forms
Tea, Capsule, Extract
Medication interactions
  • Antihypertensive drugs
  • Antidiabetic drugs
  • Diuretics
Avoid if
  • Pregnant
  • Breastfeeding
  • Taking blood pressure medication (potential additive effects)
  • Taking blood sugar medication (potential additive effects)

Community tips

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Suggested dosage

For blood pressure reduction, common dosages range from 500 mg to 10 grams per day of dried hibiscus calyx extract, often consumed as a tea (1-3 cups daily). Specific dosages can vary based on the extract concentration and preparation.

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Anthocyanins (e.g., delphinidin-3-sambubioside, cyanidin-3-sambubioside), phenolic acids (e.g., protocatechuic acid, gallic acid, chlorogenic acid), flavonoids (e.g., quercetin, luteolin), organic acids (e.g., hibiscus acid, citric acid, malic acid).

Traditional use

Hibiscus has a long history of traditional use in various cultures. In some African countries, it is used to support blood pressure and as a diuretic. In traditional Mexican medicine, it has been used for its diuretic and antiseptic properties. In other regions, it is consumed as a refreshing drink and for its perceived general health-promoting qualities.

Safety

Safety warnings

Hibiscus is generally considered safe for most adults when consumed in moderate amounts. Some individuals may experience mild gastrointestinal upset.

Avoid if

  • Pregnant
  • Breastfeeding
  • Taking blood pressure medication (potential additive effects)
  • Taking blood sugar medication (potential additive effects)

Medication interactions

  • Antihypertensive drugs
  • Antidiabetic drugs
  • Diuretics

Reported side effects

  • Stomach upset
  • Gas
  • Constipation
  • Temporary dizziness

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

Overall grade (B)

As no specific PubMed studies were provided, the evidence grade for hibiscus's efficacy in treating specific ailments is currently considered limited. General knowledge suggests traditional use and some preliminary research, but without specific study citations, a definitive evidence grade cannot be assigned. Further research, including well-designed human clinical trials, is needed to establish robust evidence.

Meta-Analyses(1)

Pooled analyses across multiple human trials.

Very High Quality

  • Efficacy of Hibiscus sabdariffa on Reducing Blood Pressure in Patients With Mild-to-Moderate Hypertension: A Systematic Review and Meta-Analysis of Published Randomized Controlled Trials.

    Abdelmonem M, Ebada MA, Diab S, Ahmed MM, Zaazouee MS, Essa TM · Journal of cardiovascular pharmacology · 2022 · n=1205

    We aimed to assess the efficacy of Hibiscus sabdariffa in patients with mild-to-moderate hypertension or metabolic syndrome (MetS) by comparing it against placebo, antihypertensive drugs, or other herbal products. Four databases were searched for randomized clinical trials (RCTs) examining the efficacy of H. sabdariffa in patients with mild-to-moderate hypertension or hypertension associated with MetS. Data on the change in systolic blood pressure (SBP) and diastolic blood pressure (DBP) were extracted and analyzed using Review Manager Version 5.3. A total of 13 RCTs (1205 participants) were analyzed. Hibiscus sabdariffa significantly reduced both SBP and DBP compared with placebo (mean difference -6.67, P = 0.004 and -4.35 mm Hg, P = 0.02). Subgroup analysis showed that change in SBP and DBP was statistically significant in patients with only hypertension, whereas not significant in patients with hypertension associated with MetS. When H. sabdariffa was compared with active controls (

    Meta-AnalysisPubMedVery High Quality

Limitations: The primary limitation is the lack of specific PubMed studies provided for review. Without this, it is challenging to assess the quality, methodology, and findings of existing research. General limitations in herbal medicine research often include small sample sizes, short study durations, lack of standardization of herbal preparations, and potential publication bias.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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