Tongkat ali, Long Jack, Eurycoma longifolia Jack
Long Jack (Tongkat Ali, Eurycoma longifolia Jack)
Long Jack or Tongkat Ali (Eurycoma longifolia Jack) is a Malaysian herb that is considered to be a powerful male aphrodisiac, tonic and energy enhancer. Tongkat Ali has an intensely bitter taste, and has traditionally been used to treat fevers and malaria. Tongkat Ali translates into ÒAli's CaneÓ, which refers to its aphrodisiac properties.
Tongkat Ali grows wild in the rainforests of the Southeast Asia. The root of the Tongkat Ali tree grows as much as one meter straight into the ground, unlike most trees, which have a horizontal root system. Tongkat Ali roots takes at least five years to mature and older trees (15-20 years) have roots that are taller than most people.
Tongkat Ali is a heating stimulant and when taken in large doses can cause side effects of insomnia, restlessness and irritability.
The exact mechanism of action of tongkat ali is not known. Studies indicate that the root contains several compounds including beta-carboline alkaloids and quassinoid-type glycosides, including eurycomaoside. [1-3]
H. H. Ang at the School of Pharmaceutical Sciences, University Science Malaysia showed in several studies that Eurycoma longifolia Jack increase libido, virility and sexual prowess in male rats. [4-11]
Extracts of Eurycoma longifolia Jack has been shown to have significant cytotoxic effect on several cancer cell lines, including breast and lung. [12-17]
Several studies showed significant anti-plasmodial activity of the quassinoids, especially eurycomanone, which confirmed its traditional use against malaria. [14, 16-21]
High doses were shown to have anti-hyperglycemic activity in rats. 
One study showed anxiolytic activity in mice. 
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