All four phytocannabinoids tested (CBD, CBDV, THCV, CBG) readily crossed the blood-brain barrier, and CBD reduced obsessive-compulsive behavior in mice on a time course matching its brain levels.
Read this if you want to understand how different cannabinoids reach and affect the brain.
All four phytocannabinoids readily crossed the blood-brain barrier
What the researchers found
Researchers mapped the pharmacokinetic profiles of four phytocannabinoids (CBD, CBDV, THCV, CBG) after single-dose administration in rats and mice by both oral and injection routes. All four compounds readily crossed the blood-brain barrier.
Absorption varied significantly by route and species. In mice, injection consistently produced higher plasma and brain concentrations. In rats, oral administration actually yielded higher brain concentrations for CBD and CBDV, but injection was better for THCV and CBG.
CBD at 120 mg/kg reduced obsessive-compulsive behavior (marble burying) in mice, with the behavioral effect timing matching its pharmacokinetic profile. This provided direct evidence linking CBD brain levels to a specific behavioral outcome.
Why it matters
Knowing how these compounds reach the brain and how long they stay there is essential for designing effective studies and, eventually, medications. The finding that oral CBD reached higher brain levels in rats than injection was counterintuitive and practically important.
The numbers in context
CBD: 120 mg/kg. CBDV: 60 mg/kg. THCV: 30 mg/kg. CBG: 120 mg/kg. All crossed blood-brain barrier. CBD reduced marble burying on a pharmacokinetic-consistent time course.
How the study worked
Pharmacokinetic study with single-dose administration of CBD, CBDV, THCV, and CBG to rats and mice via oral and intraperitoneal routes. Plasma and brain concentrations measured over time. CBD was also tested in the marble burying test for obsessive-compulsive behavior.
What this study cannot tell us
Animal study; human pharmacokinetics may differ substantially. Single-dose design does not capture effects of repeated dosing. The vehicle (solutol vs cremophor) affected brain penetration, meaning formulation matters. Only one behavioral test was used for CBD.
How to read the evidence
Animal pharmacokinetic study with practical pharmacological validation. Important reference data but animal pharmacokinetics have limited direct human applicability.
When this study was published
Published in 2012. These pharmacokinetic profiles have informed subsequent research on minor cannabinoids.
The bigger picture
Most cannabis research has focused on THC and CBD. This study provided baseline pharmacokinetic data for CBDV, THCV, and CBG, enabling future studies on these less-studied cannabinoids to use appropriate doses and timing.
Questions still open
- How do these pharmacokinetic profiles translate to humans? Can CBDV, THCV, or CBG produce behavioral effects at achievable brain concentrations? Does CBD reduce OCD-like behavior through the same pathways as serotonergic medications?
Common questions
What are CBDV, THCV, and CBG?
Can CBD help with OCD?
Read the original research
Plasma and brain pharmacokinetic profile of cannabidiol (CBD), cannabidivarine (CBDV), Δ⁹-tetrahydrocannabivarin (THCV) and cannabigerol (CBG) in rats and mice following oral and intraperitoneal administration and CBD action on obsessive-compulsive behaviour.
Psychopharmacology, 219(3), 859-73
Citation
Deiana, Serena; Watanabe, Akihito; Yamasaki, Yuki; Amada, Naoki; Arthur, Marlene; Fleming, Shona; Woodcock, Hilary; Dorward, Patricia; Pigliacampo, Barbara; Close, Steve; Platt, Bettina; Riedel, Gernot. (2012). Plasma and brain pharmacokinetic profile of cannabidiol (CBD), cannabidivarine (CBDV), Δ⁹-tetrahydrocannabivarin (THCV) and cannabigerol (CBG) in rats and mice following oral and intraperitoneal administration and CBD action on obsessive-compulsive behaviour.. Psychopharmacology, 219(3), 859-73. https://doi.org/10.1007/s00213-011-2415-0
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