Eurycoma longifolia
Also known as “Longjack” and “Tongkat Ali.” An Asian herbal aphrodisiac often found in testosterone-boosting supplements and/or supps used to enhance libido. Its use is supported by a series of studies in rodents, most of which were performed by the same researcher(s) and reported in obscure journals…more research is needed to confirm physiological effects in humans.
See Paul’s review, “Tongkat Ali (Long jack, Eurycoma longifolia) Review: Effective For Boosting Testosterone Naturally?” for more information.