Cochrane reviewed the effect of roselle (Hibiscus sabdariffa) on blood pressure in hypertensive adults.

First, the details.

  • No studies were worth reviewing.

And, the results.

  • In the absence of studies to review, there was no evidence to support drinking red tea to lower blood pressure.

The bottom line?

More than 10 years ago there was a study in rats where roselle given by injection lowered blood pressure.

But nothing in humans.

1/28/10 21:07 JR

Hi, I’m JR

John Russo, Jr., PharmD, is president of The MedCom Resource, Inc. Previously, he was senior vice president of medical communications at, a complementary and alternative medicine website.