“Cannabidiol (CBD) is a non-psychoactive cannabinoid, which is of growing medical interest. We investigated the phase I metabolism of CBD and cannabidivarin (CBDV) using in vitro experiments with human liver microsomes in order to discover so far not considered metabolites. Within these experiments, we came across decarbonylation of CBD and CBDV. Further investigations were focused on observed decarbonylated CBD (DCBD). DCBD appears to be an important supplementary human metabolite that might be helpful for the analytical confirmation of a CBD uptake and might improve the interpretation of the consumption of CBD containing products. Results of this study indicate a prolonged detectability of DCBD in comparison to CBD after oral CBD ingestion.”