Mitragyna speciosa is a tropical tree from the Rubiaceae or coffee family of plant. This evergreen tree is sometimes called Kratom in Thailand or ketum in Malaysia. The plant grows in parts of Thailand, Indonesia, Papua New Guinea and Malaysia. Mitragyna speciosa has been used in traditional medicine, mainly for its stimulant effects. Evidence suggests that Mitragyna speciosa has some central nervous system effects including antidepressant effects. These effects may be due to the presence of the alkaloid mitragynine in extracts of the plant. For example, in one study, researchers investigated the effects of 10 and 30 mg per kg mitragynine in mice following intraperitoneal injection. The results of the study showed that the mitragynine extracts significantly reduced depressive symptoms in the mice without affecting muscle function. At the same time there was a significant reduction in corticosterone secretion, suggesting that the extracts may have caused their effects through an anti-stress effect on he mice.
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