CBD works by interacting with your endocannabinoid system (ECS), a network of receptors and signaling pathways spread throughout your body that’s involved in all sorts of processes, including pain, mood, appetite, and memory. To understand how CBD does anything, you have to understand two receptors: CB1 and CB2.
CB1 and CB2 are proteins sitting on the surface of cells throughout the body, and both are part of the ECS. They’re the docking points that cannabinoids attach to, and where they’re located explains a lot about what they do.
CB1 receptors
CB1 receptors live mostly in the central nervous system, meaning the brain and spinal cord, where they help regulate mood, memory, and pain perception. They also appear in the peripheral nervous system, the nerves running from the brain and spinal cord out to the rest of the body. When THC binds to CB1 receptors in the brain, it produces effects like altered perception, mood changes, and impaired thinking, which is basically the high. But CB1 receptors do more than that, playing a role in energy balance, immune function, and cardiovascular function too. THC isn’t the only cannabinoid that can bind here; CBD and CBG can as well.
CB2 receptors
CB2 receptors are found mainly in the immune system, where they help regulate inflammation, and they also show up in the peripheral nervous system, the gastrointestinal system, the spleen, and other organs. When THC binds to CB2 receptors, it can affect immune function, inflammation, and pain sensation. Here again, CBD and CBG can bind to these receptors too. The key difference is that, unlike THC, those cannabinoids don’t produce psychoactive effects when they bind to CB2. That’s a big part of why CBD can offer benefits without the high.
Putting it together
When endocannabinoids (the ones your body makes) or plant cannabinoids like CBD and THC activate CB1 and CB2 receptors, those receptors help regulate a wide range of bodily functions. That’s the mechanism in a nutshell. The honest caveat is that researchers are still working out the exact roles of these receptors and precisely how CBD and other cannabinoids interact with them. We understand the outline well; the fine details are still being filled in.