By Serge Kreutz (2009)

Apart from all the other positive effects of tongkat ali, the water extract from the root of this miraculous plant also appears to control high blood pressure rather beautifully.

Of course, because this is a natural compound that cannot be patented by the large pharmaceutical companies who want to sell their synthetic chemicals, there has not been much incentive for research.

But here is the URL of one scientific study that is leading the way:

http://grande.nal.usda.gov/ibids/index.php?mode2=detail&origin=ibids_references&therow=795158

A printscreen can by read here:

Effect of aqueous extract of Eurycoma longifolia on blood pressure in rats