Eurycoma Longifolia Jack/Tongkat Ali Boost Testosterone at the Source

Tongkat Ali has been used for centuries as an aphrodisiac in Indonesia and Malaysia. This plant is also known as Malaysian ginseng. The mechanism of it's testosterone boost appears to be by stimulating the Leydig cells in the testes. Leydig cells convert cholesterol in to testosterone.

In addition, to boosting testosterone, tongkat ali may free up testosterone from SHBG for greater uptake by muscle tissue.

Products that a 20:1 extract appear to work the best. LJ100 found in Source Naturals Tongkat Ali and in Now Foods Testojack is a 100:1 extract.

Take 200-300mg two or three times per day.

Source Naturals Tongkat Ali, Male Libido Tonic, 120 Count

Further Reading:

Tongkat Ali boosts testosterone level and muscle strength in active over-fifties 09.09.2013
Less cortisol and more testosterone with a daily 200 mg Tongkat Ali 17.07.13
Tongkat Ali has no effect on prostate 12.07.2013
The effect of Tongkat Ali on healthy men 10.07.2013
Tongkat Ali raises testosterone levels in over-fifties 06.07.2013
Muscle building effect of Tongkat Ali shown in animal study 02.11.2009
Aphrodisiac Tongkat Ali boosts testosterone level 17.10.2009