NOW TestoJack 100 contains a potent standardized extract of Eurycoma longifolia, commonly known as Tongkat Ali or Long Jack. LJ100 contains bioactive Eurypeptides, the active constituents of Tongkat Ali. Clinical and non-clinical studies have shown that Tongkat Ali extracts support male reproductive function and healthy testosterone levels. Tribulus has been included for its virility supporting effects as shown in scientific studies. TestoJack 100 also contains ZMA, a synergistic combination of zinc and magnesium for the support of healthy immune, reproductive and neuromuscular function. This combination of ingredients in TestoJack 100 provides enhanced energy levels without the anxiety or insomnia that accompanies other energy supplements, as well as overall support for men's health.