Kratom and 7 OH products are all the buzz in smoke shops and gas stations, marketed as safe alternatives for pain relief and opioid withdrawal. But the U.S. Food and Drug Administration is 7 Hydroxymitragynine Tablets Bulk 7OH 7 Hydroxymitragynine Tablets (14MG) 15 Tablet Vape & Smoke 7 hydroxymitragynine Powder Buy Buddy 7 OH 7Ohmz 7OH Hydroxy Advance Kratom Tablet 14mg 1 Counts Per Pack Stack'd 7 OH FDA pushes for ban of potent Kratom derivative 7 OH amid safety concerns 6abc Philadelphia 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.