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Evidence-Based Supplement Research
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Hibiscus and Reduced Systolic Blood Pressure

Research synthesisLow evidenceModerate effect3 studies · 2 beneficial · 1 neutral · 0 harmful

Across 3 studies, 2 reported beneficial effects (one moderate, one large) of hibiscus on reducing systolic blood pressure, while 1 meta-analysis found neutral effects in patients with metabolic syndrome. Evidence suggests benefit is most pronounced in hypertensive individuals over 50 years of age, with effects typically observed at 4+ weeks. The median study duration was 104 days across two studies that reported duration, and the most studied doses were 10 g/day as a brew or 2×375 mg/day as tablets.

  • Effective dose range: 10 g/day (brew) or 2×375 mg/day (tablets)
  • Studied populations: Hypertensive adults over 50 years; patients with mild-to-moderate hypertension without metabolic syndrome

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. One large meta-analysis (n=1205) found neutral effects in patients with hypertension comorbid with metabolic syndrome, suggesting the benefit may not extend to all hypertensive populations. The largest meta-analysis (n=1797) indicated effects were more robust in trials lasting over four weeks and in individuals over 50 years.

Generated Jun 10, 2026
Time to effect
Median: 3.5 months · IQR 9.4 weeks–4.7 months · Range 4 weeks–6 months — Reported in 2 of 3 studies
3 of 3 papers
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