Indole Alkaloids of a Thai Medicinal Herb, Mitragyna speciosa, that has Opioid Agonistic Effect in Guinea-Pig Ileum by Horie S, Koyama F, Takayama H, Ishikawa H, Aimi N, Ponglux D, Matsumoto K, Murayama T. Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Japan. Planta Med. 2005 Mar;71(3):231-6
The article listed above discusses a bit about 7-hydroxymitragynine, and its effects. Most of kratoms effects can be related to the kratom alkaloid 7-hydroxymitragynine
Read more about kratom alkaloids here.
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