Mitragynine, commonly known as Kratom, is a major indole alkaloid found in the leaves of the Mitragynine speciosa plant. Sold online has an herbal supplement, Mitragynine possesses opioid-like effects. Despite concerns about the drug's adverse effects and potential addictiveness, Mitragynine is not a DEA scheduled substance. However, Mitragynine's appearance in postmortem toxicology and driving under the influence of drugs investigations are becoming more frequent. Mitragynine is available as reference material (bulk powder and/or solution) and as calibrated, Ready-to-Use, certified reference material (CRM). This product is designed for qualitative and quantitative protocols and can be used for forensic, toxicology, research, and other chemical/biochemical analytical applications.