Sixty-five people with pre- or mild high blood pressure were simply give three cups a day of hibiscus tea. At the end of six weeks, systolic blood pressure--the most important measure--was reduced by a significant 5.5%. . . . .  In the group given the placebo drink, there was no reduction at all. This study adds to the already existing evidence that hibiscus lowers high blood pressure.

  •  J Nutr 2010;140:298-303
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