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 FDA Pushes to Classify 7 OH Sold in Vape Shops as Illicit Drug Ecigator Unregulated opioid like drug sold in Lawrence smoke shops News kansan.com DOH raises concerns over 7 OH products DOH warns public of dangerous emerging opioid like product known as '7 OH' : Maui Now 7 O'Heaven 7 OH Kratom Vape Pen Blueberry Fast & Potent