7 Oh Hydroxymitragynine Vape PSA: Don't fall for the "natural" hype. We need to talk about 7 OH (7 hydroxymitragynine), a potent psychoactive compound being sold in gummies, candies and liquid shots 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. 7 OH, kratom removed in Florida. What to know about addictive drug