Eurycoma longifolia (commonly called tongkat ali or pasak bumi) is a flowering plant in the family Simaroubaceae. It is native to Indochina (Cambodia, Laos, Malaysia, Myanmar, Thailand and Vietnam) and Indonesia (the islands of Borneo and Sumatra), but has also been found in the Philippines. The plant is a medium-sized slender shrub that can reach 10 m (33 ft) in height, and is often unbranched. The 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.