Long Jack refers to an extremely bitter tasting herb that has been in use on medical grounds for centuries. It is also referred to as Eurycoma longifolia, Jack, Malysian Ginseng or tongkat ail. It was used as an aphrodisiac, but it has been found out that it can also promote muscle building and increase testosterone levels. Due to its ability to increase testosterone levels in men, Long Jack is considered beneficial to the human health. Its roots contain a variety of bitter organic compounds referred to as quassinoids. In reference to Miyake et al, ten different quassinoids have been discovered in Long Jack. Long Jack is found in our ULTRA TEST supplement.