NOW TestoJack 100 features LJ100, a potent standardized extract of Tongkat Ali (Eurycoma longifolia), that has been concentrated to attain an optimal ratio of bioactive compounds. Studies indicate that LJ100 may help to support male reproductive and glandular functions. This product includes Tribulus to promote male vitality, as well as ZMA, a unique formula of zinc and magnesium for the support of healthy immune, reproductive and neuromuscular function. This combination of ingredients makes TestoJack 100 the optimal formula for the overall support of men's glandular health and reproductive function.