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. 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. The Kratom Conundrum Comes to Outer Cape Cod The Provincetown Independent 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. 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