Heart & Circulation
Hibiscus
A tart floral tea steeped from dried hibiscus petals, studied in several small trials for modestly lowering blood pressure.
Heart Health
Detox
Immunity
Serving
1 cup, brewed tea (240ml)
Calories Per Serving
NA
Key nutrients
Anthocyanins, vitamin C, organic acids
Nutrient density
Not officially rated
Why it’s worth eating
Hibiscus flowers are loaded with antioxidants and vitamin C. Hibiscus tea may lower blood pressure and support heart health. Brew dried flowers for tea, or use in syrups and jams.
What you may notice
Relaxation in the evening
Mood
Markers worth tracking
Blood pressure
LDL cholesterol
How to eat it
Steep dried petals in hot (not boiling) water for 5-10 minutes, longer steeping increases tartness and color intensity.
Pairs well with
A small amount of honey, softens the tartness without diluting the antioxidant content much
Vitamin C, hibiscus already contains some, but pairing with more supports its activity
Storage
Store dried hibiscus petals in an airtight container away from light; keeps for up to a year.
The numbers, per 1 cup, brewed tea (240ml)
NA
Vitamin K
NA
Vitamin A
NA
Vitamin C
NA
Calcium
NA
Iron
NA
Magnesium
NA
Potassium
NA
Vitamin B12
NA
Vitamin D
Fiber
NA
No matching USDA FoodData Central entry found
Evidence
A
THE STRONGEST WHOLE-FOOD EVIDENCE IN THE FINAL GROUP: multiple RCT meta-analyses converge on a real, dose-dependent blood-pressure reduction achievable with ordinary tea.
Study dose vs. serving
ACHIEVABLE FROM TEA: hibiscus lowered systolic BP by 7.10 mmHg (95% CI -13.00 to -1.20) versus placebo, dose-dependently, with most trials using steeped dried calyx (commonly 1.25-2 g calyx, often 2-3 cups/day). Effects were greatest in people over 50 and in trials longer than 4 weeks. Not superior to antihypertensive drugs, and not effective in metabolic syndrome.
Ellis/Najjar group. Nutr Rev. 2022;80(6):1723 (17 chronic trials). Plus dose-response meta-analysis, Pharmacol Res. 2025, S096522992500010X: 26 RCTs, 1,797 participants.
Use caution if
You take blood pressure medication, hibiscus can have an additive blood-pressure-lowering effect
You're pregnant, hibiscus tea is traditionally advised against in pregnancy; check with a doctor
Details
Type
Season
Dried calyces shelf-stable, year-round
Forms
Dried calyx, tea bags, standardised extract, juice (agua de jamaica)
Price
Budget
Bioactive
Anthocyanins and hibiscus acid (a hydroxycitric-acid lactone)
Heat stable
Partial - steep rather than boil to limit anthocyanin degradation
Watch
DOCUMENTED DRUG INTERACTIONS: hibiscus reduces plasma levels of chloroquine and acetaminophen (increased elimination) and raises or prolongs levels of diclofenac and simvastatin (reduced elimination). Animal work shows increased hydrochlorothiazide AUC and reduced captopril AUC. PREGNANCY AND LACTATION: avoid - safety data are lacking and hibiscus is traditionally an emmenagogue and uterine stimulant. Human safety is generally good below about 500 mL of tea/day for up to 6 months.
Reliability
3 / 5
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