A popular roselle variety planted in Malaysia, aka variety Terengganu. Roselle fruits are harvested fresh, and their calyces are made into a drink rich in vitamin C and anthocyanins.
In Malaysia, roselle calyces are harvested fresh to produce pro-health drink due to high contents of vitamin C and anthocyanins.
In Thailand, Roselle is drunk as a tea, believed to also reduce cholesterol
Medicinal uses
Many parts of the plant are also claimed to have various medicinal values. They have been used for such purposes ranging from Mexico through Africa and India to Thailand. Roselle is associated with traditional medicine and is reported to be used as treatment for several diseases such as hypertension and urinary tract infections.[citation needed] There is currently insufficient evidence to demonstrate any beneficial effect of roselle on raised blood pressure[5] or on blood lipid lowering.[6] Experimental results are contradictory.[7]
Hibiscus sabdariffa has shown in vitro antimicrobial activity against E. coli.[8] A recent review stated that specific extracts of H. sabdariffa exhibit activities against atherosclerosis, liver disease, cancer, diabetes and other metabolic syndromes
Phytochemicals
The plants are rich in anthocyanins, as well as protocatechuic acid. The dried calyces contain the flavonoids gossypetin, hibiscetine and sabdaretine. The major pigment, formerly reported as hibiscin, has been identified as daphniphylline. Small amounts of myrtillin (delphinidin 3-monoglucoside), Chrysanthenin (cyanidin 3-monoglucoside), and delphinidin are also present. Roselle seeds are a good source of lipid-soluble antioxidants, particularly gamma-tocopherol.
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