11-hydroxy-THC is a more potent form of THC that is produced when delta-9-THC is broken down. After delta-9-THC has been swallowed, the body breaks down and metabolizes it, producing the metabolite 11-hydroxy-THC. The metabolite is generally considered much more potent than its precursor.Vaping with 11-hydroxy-THC carts is much more potent than regular THC. This means that even small doses of 11-hydroxy-THC can cause a high. Because of this, it is important to use caution when vaping with 11-hydroxy-THC cartridges. If you are using them for recreational purposes, it is best to avoid using too many at once or vaping heavily for extended periods of time.