Every lab-tested product on a dispensary shelf comes with a panel of numbers — THC, CBD, sometimes CBG or CBN, listed as percentages. These are cannabinoids: the chemical compounds unique to the cannabis plant that interact with receptors throughout the human body. Researchers have identified over 100 of them, but only a handful show up in meaningful amounts and actually shape the experience. Here is what each one does.
The endocannabinoid system: your body already speaks this language
Cannabinoids work because the human body has its own built-in system for them, called the endocannabinoid system (ECS). Discovered by researchers in the early 1990s, the ECS is a network of receptors — mainly CB1 (concentrated in the brain and nervous system) and CB2 (concentrated in the immune system) — that regulate mood, appetite, sleep, pain sensation, and inflammation. Your body produces its own cannabinoid-like molecules to keep these systems balanced. Plant cannabinoids simply plug into the same receptors.
THC — Tetrahydrocannabinol
The primary intoxicating cannabinoid and the one most associated with the classic cannabis experience: mood lift, altered perception, appetite increase, and relaxation. THC binds directly to CB1 receptors in the brain. Effects and intensity scale with dose — a 15% THC flower and a 30% THC concentrate are very different experiences, regardless of strain name.
CBD — Cannabidiol
Non-intoxicating and widely researched for its calming, anti-inflammatory properties. CBD does not bind strongly to CB1 receptors, which is why it does not produce a high on its own. Instead, it appears to modulate how THC behaves — many users report that CBD-rich products feel smoother and less anxious than THC-only equivalents at the same dose. Products with a balanced THC:CBD ratio are often the most beginner-friendly on the menu.
CBG — Cannabigerol
Known as the "mother cannabinoid" because THC and CBD are both synthesized from CBG earlier in the plant's growth cycle. Non-intoxicating, present in smaller quantities, and the subject of growing research interest for its distinct, clear-headed profile compared to CBD.
CBN — Cannabinol
Forms as THC ages and degrades — older cannabis naturally develops more CBN. Popularly associated with sedation and is increasingly formulated into nighttime products, though large-scale clinical research on this specific effect is still developing.
THCA — the raw, non-intoxicating precursor
Fresh cannabis flower is almost entirely THCA, not THC. THCA only converts to intoxicating THC when heated — through smoking, vaping, or cooking, a process called decarboxylation. This is why raw cannabis leaves do not get you high, and why a lab panel lists both THCA and total THC separately.
Many researchers believe cannabinoids and terpenes work synergistically rather than independently — meaning a full-spectrum product with multiple cannabinoids and terpenes can produce a different, often more balanced, effect than an isolated compound at an identical dose. It is one reason two products with the same THC percentage can feel noticeably different.
Reading a lab label like a pro
- Total THC / Total CBD — the lab's calculated potency after accounting for decarboxylation. This is the number that predicts intensity.
- Minor cannabinoids (CBG, CBN, CBC) — listed when present in testable amounts; look here if you are chasing a specific effect beyond THC and CBD.
- Terpene profile — often on the same panel; pairs with cannabinoids to round out the entourage effect. (More on this in our terpenes guide.)
Browse lab-tested products by cannabinoid
Every product on the menu lists full cannabinoid content — filter by THC, CBD, and more.