United States, July 15 -- The U.S. Food and Drug Administration today announced seven recent warning letters sent to companies for illegally marketing products containing 7-hydroxymitragynine, also known as 7-OH.1 This action reflects the Agency's growing concern around novel potent opioid products being marketed to U.S. consumers and sold online and in smoke shops, gas stations, and corner stores. While 7-OH occurs naturally in trace amounts in kratom, the Agency's letters focus on concentrated 7-OH products such as tablets, gummies, drink mixes, and shots, which may be dangerous. 7-OH is not lawful in dietary supplements and cannot be lawfully added to conventional foods. Additionally, there are no FDA-approved drugs containing 7-OH, and ...