Hibiscus Flower Extract
Also known as: Hibiscus sabdariffa, roselle, sour tea, hibiscus calyx extract, karkade
An extract of the deep red calyces of Hibiscus sabdariffa, the plant behind hibiscus tea, used in heart-health and hydration formulas. A systematic review and meta-analysis of randomized trials found that hibiscus preparations lowered systolic and diastolic blood pressure compared with placebo or other beverages, mostly in studies using tea or aqueous extracts over a few weeks. Its tart cranberry-like flavor and natural red color make it easy to build into drink mixes and gummies.
Research summary
Anthocyanins and hibiscus acids are proposed to inhibit angiotensin-converting enzyme, promote mild diuresis, and support endothelial nitric oxide activity.
Dosage
Daily amounts, of extract.
| Lowest studied | Typical range | Highest studied | Upper limit |
|---|---|---|---|
| — | 500–1,000 mg | — | — |
500 to 1,000 mg per day of calyx extract, split with meals or in a beverage. Most trials used tea made from several grams of dried calyx, so extract doses are inferred from those; blood pressure changes were seen over two to six weeks.
Standardization: Standardized to anthocyanins or 10:1 extract, grade dependent
Source material: calyx extract
Format suitability
- Capsule
- Powder
- Tablet
- Softgel
- Gummy
- Liquid
Tart, cranberry-like flavor and bright red color; excellent in drink mixes and gummies. Acidic, so check compatibility with pH-sensitive actives.
Formulation notes
May add to effects of blood-pressure medications and diuretics; note on labels. Pairs with beet root, magnesium, or potassium in heart formulas.
- Notable drug interactions
Sources
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