Endocannabinoid System · ECS
The endocannabinoid system (ECS) is a signalling network in the human body involved in regulating processes such as mood, sleep, appetite and the response to stress. Cannabinoids like CBD interact with this system.
The ECS includes receptors (CB1 and CB2), naturally produced “endocannabinoids”, and enzymes that build and break them down. It is often described as a balancing or “homeostatic” system.
Plant cannabinoids (phytocannabinoids) such as CBD interact with this system indirectly, which is one reason CBD is studied across such a wide range of wellness contexts.
Why it matters
Understanding the ECS is the “why” behind cannabinoids, it explains how a single plant compound can be relevant to calm, sleep and recovery alike.
Related terms
CBD (cannabidiol) is a naturally occurring, non-intoxicating compound found in hemp. It is the most studied cannabinoid after THC and is widely used in wellness products such as oils, gummies and topicals, without producing a “high”.
CBGCBG (cannabigerol) is a non-intoxicating cannabinoid often called the “mother cannabinoid” because its acidic form, CBGA, is the precursor the plant converts into CBD, THC and other cannabinoids.
BioavailabilityBioavailability is the proportion of CBD that actually reaches your bloodstream after you take it. It varies a lot by format, sublingual oils and inhalation are higher, while swallowed capsules and edibles are lower because of digestion.
Frequently asked
Do humans produce cannabinoids?
Yes, the body makes its own “endocannabinoids” as part of the ECS.
Last updated 2026-06-29. Educational information only, not medical advice. meryjwellness.com