Know what you're putting in your body.
158 herbs, nutrients, and compounds. What the science says, what tradition knew, and what to watch for. Founding members keep this running.
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Hibiscus
also known as roselle
The deep red calyx of the roselle plant, sold as 'sour tea' in much of the world and as agua de jamaica in Latin America. Tart, refreshing, and one of the few culinary herbs with solid evidence for lowering blood pressure.
- Modestly lowers blood pressure with daily use — comparable in effect to some prescription starting doses in mild hypertension
- Modestly lowers LDL cholesterol
- Rich in the deep red antioxidant pigments found in dark berries
- May support liver function and metabolic health
- Mild diuretic action
- Pleasant tart flavor makes daily use easy — usually consumed as cold or hot tea
- A Comparative Study of Iron Bioaccessibility and Antinutrient Levels in Hibiscus sabdariffa (Roselle) Leaves and Calyces and Persea americana (Avocado) Leaves and Seeds: Nutritional Implications.
- Fabrication of pH-Sensitive Bacterial Cellulose Films by Acetic Acid Fermentation of Anthocyanin-Rich Roselle (Hibiscus sabdariffa L.) Extracts for Real-Time Monitoring of Chicken Meat Spoilage.
- Comparison of Hibiscus sabdariffa L. extract and hydrochlorothiazide as adjuncts to Valsartan in managing hypertension in type 2 diabetic nephropathy: A randomized clinical trial.
Memorial Sloan Kettering About Herbs · EMA Herbal Medicinal Product Monographs · American Botanical Council HerbMedPro · Memorial Sloan Kettering About Herbs · EMA Herbal Medicinal Product Monographs · American Botanical Council HerbMedPro
Know what you're putting in your body.
158 herbs, nutrients, and compounds. What the science says, what tradition knew, and what to watch for. Founding members keep this running.
Founding rate — locked for life. Regular price after launch: $96/year.
- ✓ Full access to all 158+ entries
- ✓ Print-ready reference card for every herb
- ✓ Monthly curated set — 5 herbs, one body system
- ✓ The Sunday Letter — weekly research digest
- ✓ Bookmarks synced across devices
- ✓ Founding rate locked forever
Cancel any time. No questions asked.