Roselle is native to tropical Africa, but today grows throughout many tropical areas. This annual herb produces elegant red flowers. The flowers (calyx and bract portions) are collected when slightly immature. The major producing countries are Jamaica and Mexico.
| Product name | hibiscus |
| CAS No. | 71149-61-6 |
| MW | 376.31 |
| MF | C18H16O9 |
Hypertension

A randomized clinical trial evaluated the effect of sour tea available commercially in Iran on essential hypertension in otherwise healthy volunteers. A decrease in blood pressure was seen. However, after cessation of drinking the sour tea, a rise in blood pressure occurred. Although no adverse effects were seen in this study, the use of sour tea for treating hypertension requires further study.
Antibacterial/Vermifuge
Aqueous extracts of hibiscus appear to exert a slight antibacterial effect. In laboratory and animal studies, worms were killed by hibiscus extracts. Research reveals little or no clinical data regarding the use of hibiscus as an antibacterial or vermifuge (kill worms).
Chemopreventive effects
Components of hibiscus have shown potential as a chemopreventative agent against tumor promotion in laboratory and animal studies. These components also possess anti-inflammatory properties. Research reveals little or no clinical data regarding the use of hibiscus as a chemopreventive agent.
Laxative effects
The plant has been used as a mild laxative. While animal studies show a mild cathartic effect, research reveals little or no human clinical data regarding the use of hibiscus as a laxative.
Other uses
Hibiscus has been studied for its use in preventing renal stone formation, as well as its respiratory and sedative effects. To date there is no clinical evidence to prove any of these beneficial medical effects. Additionally, hibiscus anthocyanins have shown antioxidant activity in protecting against hepatotoxicity in rats. Application and action in humans has yet to be investigated.
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