Big effect
Hibiscus lowered systolic blood pressure by more than 10 mmHg in a meta-analysis — but the effect was clearest in adults over 50 and in trials lasting longer than four weeks.
This is the first indexed analysis to suggest hibiscus can lower blood pressure as much as some prescription drugs, but the finding is based on a specific subgroup (older adults, longer trials) and the overall body of evidence is still thin, so it's not yet a general recommendation.
A meta-analysis of nearly 1,800 people found that hibiscus tea or extract lowered systolic blood pressure by a moderate amount — over 10 mmHg — comparable to antihypertensive medications. However, the benefit was strongest in people over 50 and in studies that lasted more than a month, and the analysis didn't specify the dose used, so it's unclear how much you'd need to take to get the same effect.
Where this fits in the evidence
Pillser has synthesized 3 studies on Hibiscus for Reduced Systolic Blood Pressure — overall evidence strength: Low.
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.
The study
- Meta-Analysis
- n = 1,797
- 2025-05
- Complementary therapies in medicine
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.