‘Gas-Station Heroin’ Sold as Dietary Supplement Alarms Health Officials - The New York Times

Often sold as a dietary supplement and promoted by retailers as a mood booster and focus aid, tianeptine is among a growing, unregulated class of potentially addictive products available in gas stations, convenience stores and smoke shops and across the internet. They typically include synthetic pharmaceuticals and plant-derived substances. 

Some, like kratom and phenibut, can be addictive and, in rare cases, fatal. They often originate in other countries, including Indonesia and Russia, where they are commonly used, even prescribed, for mood management. But the Food and Drug Administration has not approved them as medicines in the United States...

https://www.nytimes.com/2024/01/10/health/gas-station-heroin-tianeptine-addiction.html