Parents: Have You Heard of 7 OH? A new substance called 7 OH ( 7 Hydroxymitragynine) is starting to appear in gas stations, vape shops, and online stores, and many people don't realize the risks. Today, we announced the issuance of seven warning letters to companies illegally marketing products containing 7 hydroxymitragynine (7 OH). https: www.fda.gov news events press announcements fda issues warning letters firms marketing products 7 Oh Mitragynine Vape What is 7 OH? 7 OH stands for 7 Hydroxymitragynine. It is a strong chemical found in very small amounts in the kratom plant. Some products sold in stores have much Doctors are warning about a substance they call gas station heroin that is available over the counter at vape stores across Arizona. The product is called 7 OH, a component derived from kratom. Pseudoindoxyl Vape 7rx Pseudo 7OH Kratom Extract Tablets 90mg 3ct (30mg tab Is Pseudoindoxyl Legal Australia FDA and Kratom FDA