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Hibiscus sabdariffa

Cardiovascular · Blood pressure · Polyphenol

Tier 2 — Promising

What it is

Polyphenol-rich tea/extract from the Hibiscus sabdariffa calyx with consistent small-RCT evidence for modest systolic BP reduction (3-7 mmHg) at 240-720 mg/day standardised extract or 2-3 cups of tea daily. Mechanism is partly ACE-inhibitor-like and partly mild diuretic. Cleanly safe in healthy adults; caution with antihypertensives (additive lowering), lithium (reduced excretion), and acetaminophen (PK changes). Avoid mega-doses in pregnancy.

Efficacy

3/5

Safety

4/5

Research

3/5

Onset

3/5

Cost

4/5

Drug-int.

3/5

Dose

240-720 mg/day standardised extract (≥1.4% anthocyanin) OR 2-3 cups infused tea daily

Time of day & tips

Use sour-tea form (jamaica, karkadeh, sorrel); steep 5-10 min; effect appears at 4-6 weeks; do not mega-dose in pregnancy.

Sensitive populations: This supplement's evidence base touches pregnancy, pediatric, or other sensitive populations. Confirm any change with your healthcare provider before use.

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