California Takes On Potent Synthetic Drug 7 OH KQED Kratom and 7 OH in Oklahoma: Is the opiate like substance dangerous? Scientists say it's stronger than morphine. It's on sale over the counter. 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.