The supply of high potency opioids is expanding through products sold legally as herbal supplements in gas stations, vape shops, and convenience stores. The most prominent is 7 hydroxymitragynine, also known as 7 OH. 7 OH Vape 7 Oh Hydroxymitragynine Vape 7 Oh Vape Kaufen 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. 7 hydroxymitragynine Vape 7 Hydroxy Kratom Vapes