Vape Shops Are Selling 7 OH: The Dangers Behind the Counter What is 7 OH? Understanding the Banned Kratom Compound Still Detox Swipe through to learn about 7 OH (7 hydroxymitragynine), a potent psychoactive compound found in the Kratom plant. As we move past the peaks of RX pills and fentanyl, 7 OH is emerging as a 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