There are millions of people in the US and elsewhere who believe that kratom is safe and useful.
The American Kratom Association is an organization that advocates on behalf of those people.
Please visit the AKA website for more information on MItragyna speciosa.
A reputable supplier of imported kratom is HerbStomp, in Portland, Oregon.
A 2009 study from the Department of Medicinal Chemistry & National Center for Natural Products Research at the University of Mississippi investigated the constituents of the leaves of M. speciosa that was grown at the University of Mississippi.