Dietary Supplement. Male Performance Formula. Supports healthy sexual activity. Virility enhancement*. Vegetarian/ Vegan. Quality GMP Assured. LJ100 Tongkat Ali NOW® TestoJack 100™ contains a potent standardized extract of Eurycoma longifolia, commonly known as Tonkat Ali or Long Jack. LJ100® contains bioactive Eurypeptides, the active constituents of Tongkat Ali. Studies have shown that Tongkat Ali extracts support male reproductive function and halthy testosterone levels. Tribulus has been included for its virility supporting effects as shown in scientific studies.&nbs.