Kra Thum Kok (Mitragyna hirsuta)
Mitragyna hirsuta is a genus of trees in the Rubiaceae family. The tree is tall, and is found in parts of Cambodia, Thailand and Vietnam. Members of this genus contain indole alkaloids, which have antimalarial and analgesic properties. The leaves of the Mitragyna Hirsuta tree, called Kra Thum Kok, have long been used as a folk remedy and are known for both their stimulating and sedating effects. Small doses stimulate the user, while larger doses, have a relaxing, sedating, and pain relieving effect. This is a much safer and healthier alternative than the highly addictive opiate and opiate like substances, which produce the same effect. The leaves are either brewed with hot water or are chewed, sometimes with Areca Nut (Areca catechu); to achieve the stimulating effect. The plant also contains a number of alkaloids including Mitraphylline, which has been shown to inhibit the growth of cancer.