Objectives: To review the literature regarding label accuracy and contamination of medical cannabinoid-based products.
Methods: A systematic review with meta-analysis following PRISMA guidelines. This study is registered with PROSPERO (CRD42019131565).
Results: Five studies reported label accuracy data ranging between 17% and 86%. Four studies reported contaminants, including pesticides, solvents and AB-FUBINACA. Meta-analysis was limited to the proportion of pesticide-contaminated samples found in two studies (0.25 (95% CI [0.10, 0.40])) and displayed significant heterogeneity.
Conclusions: Label inaccuracies and contaminants are found across a spectrum of cannabinoid-based products. The review highlights the paucity and heterogeneity of research relating to cannabinoid-based products in light of changing global legislation. Further robust research is required to support ongoing pharmacovigilance and patient safety.
Keywords: accuracy; cannabinoids; cannabis-based products; contaminants; labelling.