Li X, Ndungu P, Taneja SB, Chapin MR, Egbert SB, Akenapalli K, Paine MF, Kane-Gill SL, Boyce RD. An evaluation of adverse drug reactions and outcomes attributed to kratom in the US Food and Drug Administration Adverse Event Reporting System from January 2004 through September 2021. Clin Transl Sci. 2023 Jun;16(6):1002-1011. doi: 10.1111/cts.13505. Epub 2023 Mar 20. PMID: 36861661; PMCID: PMC10264943.