Skip to main content
Evidence-Based Supplement Research
Evidence-Based Supplement Research
Pillser
Search
Sign UpLog In

Hibiscus and Reduced Diastolic Blood Pressure

Research synthesisLow evidenceMixed effect size3 studies · 2 beneficial · 1 neutral · 0 harmful

Across 3 studies, 2 reported beneficial effects on diastolic blood pressure, with effect sizes ranging from small to moderate (mixed). The most recent and largest meta-analysis (2025, n=1797) found moderate reductions in DBP, particularly in individuals over 50 years and in trials lasting at least 4 weeks. The median study duration was 28 days. Evidence is limited to a small number of studies, and one high-quality meta-analysis (2022) found no significant overall effect in patients with hypertension and metabolic syndrome, suggesting population-specific responses.

  • Studied populations: Adults with mild-to-moderate hypertension; effects may be more pronounced in individuals over 50 years and in those with type 2 diabetes, but less consistent in those with metabolic syndrome.

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. One high-quality meta-analysis (2022) found no significant effect in patients with hypertension and metabolic syndrome, indicating benefit may be limited to certain subgroups. No dosage or form data were available to identify optimal intake. Median study duration was 28 days; longer-term effects are not well characterized.

Generated Jul 18, 2026
Time to effect
Median: 4 weeks · IQR 4 weeks–4 weeks · Range 4 weeks–4 weeks — Reported in 1 of 3 studies
Safety in these studies
3 of 3 papers
Back to top