7 hydroxymitragynine Vape 7 Hydroxy Kratom Vapes 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. 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 7oh Vape 7 O'Heaven 7 OH Kratom Vape Pen 7oh Vape 7 O'Heaven 7 OH Kratom Vape Pen