pumpkin seed extract supplement - X-TEND ENERGY COMPLEX, with Tongkat Ali, Maca, L-Arginine - maca vitaminas, 3 Bottles (180 Capsules) In densely shaded greenery in the sweltering hot Malaysian rainforest, I watched three aboriginal men chop a mature Longjack, one of the most powerful plants on earth, out of dense soil. Researching energy plants often puts me in marvelous and remote places. In this instance, the trail led me to Malaysia to research Longjack. It is a popular folk name for Eurycoma longifolia, a medium size slender tree reaching 10 metres in height. Longjack is native to Malaysia, lower Burma, Thailand, and Indonesia. Longjack enjoys both a long history of traditional use, and a growing body of serious science corroborating its efficacy.