Two magnesium-stabilized cannabidiolic acid (CBDa) hemp extracts showed dose-dependent seizure protection in rats, with the extract containing minor cannabinoids (Chylobinoid) more effective than the pure CBDa extract despite lower CBDa content.
Epilepsy pharmacologists, cannabis formulation developers, entourage effect researchers
Multi-cannabinoid extract more effective than purified CBDa despite lower CBDa content
What the researchers found
In the maximal electroshock seizure test, Chylobinoid (CBDa plus minor cannabinoids) had an ED50 of 76.7 mg/kg, Mg-CBDa (purified) had an ED50 of 115.4 mg/kg, and CBD had an ED50 of 68.8 mg/kg. Chylobinoid was more effective than Mg-CBDa despite lower CBDa content, suggesting minor cannabinoid constituents contribute an "entourage" effect.
Why it matters
CBDa (the acid precursor to CBD) is chemically unstable, limiting its clinical potential. Magnesium stabilization may solve this problem, and the entourage effect from minor cannabinoids suggests whole-plant extracts could outperform purified compounds.
The numbers in context
ED50 values adjusted for CBDa content: Chylobinoid 76.7 mg/kg (95% CI: 51.7-109.2); Mg-CBDa 115.4 mg/kg (95% CI: 98.8-140.9); CBD 68.8 mg/kg (95% CI: 56.6-80.0)
How the study worked
Sprague-Dawley rats received intraperitoneal injections of Chylobinoid, Mg-CBDa, or CBD at varying doses. Seizure protection assessed using maximal electroshock seizure test with corneal stimulation. Dose-response curves calculated using Probit analysis.
What this study cannot tell us
Acute seizure model; chronic epilepsy models needed. Intraperitoneal route differs from oral administration used clinically. Specific minor cannabinoids responsible for the entourage effect not identified. Single seizure model type.
How to read the evidence
Well-controlled pharmacological study with clear dose-response data, but limited to one acute seizure model.
When this study was published
Published in 2021.
The bigger picture
The finding that the multi-cannabinoid extract outperformed the purified CBDa preparation provides experimental support for the entourage effect hypothesis, a major topic of debate in cannabis pharmacology.
Questions still open
- Which minor cannabinoids in Chylobinoid drive the entourage effect? Would CBDa-enriched extracts be effective in pharmacoresistant seizure models? How does magnesium stabilization affect long-term CBDa bioavailability?
Common questions
What is CBDa?
What is the entourage effect?
Read the original research
Cannabidiolic acid exhibits entourage-like improvements of anticonvulsant activity in an acute rat model of seizures.
Epilepsy research, 169, 106525
Citation
Goerl, Brett; Watkins, Sarah; Metcalf, Cameron; Smith, Misty; Beenhakker, Mark. (2021). Cannabidiolic acid exhibits entourage-like improvements of anticonvulsant activity in an acute rat model of seizures.. Epilepsy research, 169, 106525. https://doi.org/10.1016/j.eplepsyres.2020.106525
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