Kratom does indeed contain opioids. It’s textbook. Specifically, this is the web page for the textbook Kratom and Other Mitragynines: The Chemistry and Pharmacology of Opioids from a Non-Opium Source : https://www.routledge.com/Kratom-and-Other-Mitragynines-The-Chemistry-and-Pharmacology-of-Opioids/Raffa/p/book/9780367…