Hibiscus tea (Hibiscus sabdariffa)
Tropical sour-tea infusion with meta-analysis support for modest blood pressure reduction.
Why
Hibiscus sabdariffa calyx is consumed as a tart red infusion across Africa, the Middle East and Latin America. Meta-analyses of RCTs report systolic blood pressure reductions of around 7 mmHg and diastolic reductions of around 3 mmHg in adults with mild-to-moderate hypertension, magnitude comparable to low-dose antihypertensive monotherapy. A separate small body of work supports modest LDL cholesterol reductions.
How it works
Anthocyanins, flavonoids and organic acids inhibit angiotensin-converting enzyme activity (mild ACE inhibition), increase endothelial nitric oxide production, and have mild diuretic effects. Combined effect drops systemic vascular resistance.
Expected onset · BP effect emerges over 2–6 weeks of daily intake
How to take
Dosage
Tea: 1–2 teaspoons dried calyx in 250 ml hot water, 2–3 cups/day. Standardised extract: 250 mg twice daily.
Timing
Throughout the day; can be consumed cold as iced tea
On the label
Dried calyx (the red flower part), distinct from hibiscus rose-of-Sharon (Hibiscus syriacus) which is a different species. Standardised extract with stated anthocyanin content.
Ideal for
Adults with mild-to-moderate hypertension seeking a dietary blood-pressure approach; people who enjoy sour herbal teas.
Safety
Evidence
Serban 2015 J Hypertens meta-analysis (5 RCTs, n=390): hibiscus tea reduced systolic BP by 7.6 mmHg and diastolic by 3.5 mmHg vs control. McKay 2010 RCT (n=65 prehypertensive adults): 3 cups/day of hibiscus tea reduced systolic BP by 7.2 mmHg vs 1.3 mmHg on placebo at 6 weeks, effect concentrated in those with higher baseline BP.
Where to get it
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