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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Hibiscus and Reduced Systolic Blood Pressure

Research synthesisModerate evidenceMixed effect size4 studies · 3 beneficial · 1 neutral · 0 harmful

Across 4 studies, 3 reported beneficial effects on reducing systolic blood pressure, with effect sizes ranging from small to large; one study found neutral results. The two strongest meta-analyses (2025 and 2022) both had evidence scores of 7, one showing moderate beneficial effects and the other showing small neutral effects, resulting in mixed overall effect sizes. The median study duration was 104 days, suggesting effects are typically observed over several months, though doses varied widely (e.g., 2×375 mg/day tablet or 10 g/day brew in one study).

  • Studied populations: clinical populations with mild-to-moderate hypertension, including individuals over 50 years and those with type 2 diabetes; effects were also noted in patients with hypertension alone but not consistently in those with metabolic syndrome.

Caveats: Available evidence is overwhelmingly positive (75% of studies reported benefits) — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Evidence base is small (only 4 studies) — conclusions should be considered preliminary. The neutral meta-analysis (2022) noted that benefits were not significant in patients with hypertension and metabolic syndrome, indicating potential population-specific limitations.

Generated Jul 18, 2026
Time to effect
Median: 3.5 months · IQR 9.4 weeks–4.7 months · Range 4 weeks–6 months — Reported in 2 of 4 studies
Safety in these studies
4 of 4 papers
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