Eurycoma longifolia (commonly called tongkat ali or pasak bumi) is a flowering plantThe root of the plant has been used in folk medicine of the South East Asian region, and in modern times has common use as supplements, as well as food and drink additives.
 
As a supplement, it has been marketed for the supposed benefits of sexual health improvement, as an energy and stamina booster, for improving blood circulation and fat reduction.
 
Tongkat ali, or longjack, is an herbal supplement suggested to improve low stress, male fertility, anxiety, athletic performance, and muscle mass
 
 They concluded that tongkat ali might be an effective remedy for modern-day chronic stress, sleep deprivation, and exercise training.