What Are Cannabinoids? A Plain-English Guide

What Is a Cannabinoid?

Cannabinoids are a class of compounds that interact with the body's endocannabinoid system — a built-in network of receptors that helps regulate mood, pain, appetite, sleep, and more. The term covers three distinct categories:

Phytocannabinoids — produced naturally by Cannabis sativa and a small number of other plants
Endocannabinoids — produced internally by the human body (and other vertebrates)
Synthetic cannabinoids — manufactured in a laboratory, either to mimic natural cannabinoids or to produce novel pharmacological activity

In everyday use, "cannabinoids" almost always means phytocannabinoids — the compounds from cannabis. Over 120 distinct phytocannabinoids have been identified, but fewer than a dozen show up in concentrations high enough to matter in commercial products.

The Raw Form vs. the Active Form

Most cannabinoids exist in the plant as acid precursors — THCA, CBDA, CBGA, CBCA — before heat converts them into the forms you're more familiar with: THC, CBD, CBG, CBC. This conversion is called decarboxylation, and it happens when you smoke, vape, or cook cannabis. The raw acid forms are non-intoxicating and have their own distinct properties. Understanding this distinction matters because products made from raw or cold-extracted hemp may contain significant amounts of acid-form cannabinoids.

All cannabinoids are fat-soluble — they dissolve in oils but not in water. This is why cannabis products are typically oil-based, why edibles use fat as a carrier, and why cannabinoids can accumulate in body fat and show up in drug tests days or weeks after use.

How Cannabinoids Are Made in the Plant

The cannabis plant doesn't produce THC or CBD directly — it starts with a single compound and uses enzymes to build from there:

CBGA: The Starting Point

Everything begins with CBGA (cannabigerolic acid), formed in the plant's resin glands. CBGA is the common precursor from which all major cannabinoids derive — sometimes called the "mother cannabinoid."

Three Competing Enzymes

From CBGA, three enzymes take it in different directions:

| Enzyme | Makes | Converts to (with heat) | |--------|-------|--------------------------| | THCA synthase | THCA | THC | | CBDA synthase | CBDA | CBD | | CBCA synthase | CBCA | CBC |

Which enzyme dominates is determined by the plant's genetics. A cultivar where THCA synthase dominates becomes a high-THC plant. Where CBDA synthase dominates, you get hemp. This is why different strains have such different cannabinoid profiles — it's not random, it's written into the plant's DNA.

Leftover CBGA that isn't converted by any enzyme becomes CBG.

The Major Cannabinoids at a Glance

The Most Common and Well-Studied

THC (Δ9-Tetrahydrocannabinol) — the primary psychoactive constituent of cannabis; partial agonist at CB1 and CB2 receptors. Federally Schedule I in the US when derived from marijuana; federally legal at ≤0.3% in hemp.

CBD (Cannabidiol) — the dominant cannabinoid in hemp cultivars; non-intoxicating; indirect modulator of the ECS. One FDA-approved drug (Epidiolex). Federally legal when hemp-derived.

THCA — the acid precursor to THC; non-psychoactive in raw form but converts to THC upon heating. Present in high concentrations in fresh, live cannabis.

CBDA — the acid precursor to CBD; emerging research on anti-nausea and anti-inflammatory effects.

CBG — the decarboxylated form of CBGA; non-intoxicating; anti-inflammatory and antibacterial properties; growing commercial market.

CBGA — the universal precursor; non-intoxicating; present in hemp at commercially significant concentrations.

CBN — an oxidative breakdown product of THC; mildly sedating; growing wellness market despite thin clinical evidence.

CBC — non-intoxicating; TRP channel pharmacology; measured on standard potency panels.

THCV — a propyl-chain homolog of THC; appetite-suppressing; partial CB1 agonist.

Why Some Cannabinoids Get You High and Others Don't

Not all cannabinoids produce intoxication. The high from cannabis comes from activating CB1 receptors in the brain — specifically in areas involved in mood, reward, and cognition. Only some cannabinoids do this:

THC: Activates CB1 strongly → causes a high
THCV (high doses): Weakly activates CB1 → mild psychoactivity
CBN (very high doses): Very weakly activates CB1 → slight effect
CBD, CBG, CBC, CBDA, CBGA, THCA: Do not meaningfully activate CB1 → no intoxication

The acid forms (THCA, CBDA, CBGA) are non-intoxicating in part because their carboxylic acid group changes the shape of the molecule enough that it doesn't fit CB1 receptors the same way.

How Cannabinoids Get Into Products

Cannabis goes through several processing steps before becoming the products you see on shelves:

Extraction pulls cannabinoids from the plant material using solvents (CO₂, ethanol, or hydrocarbons like butane). CO₂ extraction is considered the cleanest method for consumer products.

Distillation refines the extract to high-purity cannabinoid distillate (80–99% purity), removing most terpenes and minor cannabinoids in the process.

Isolation purifies a single cannabinoid to near-pure crystalline form (99%+). CBD isolate and THC isolate are the most common examples.

Full-spectrum extracts preserve the complete cannabinoid and terpene profile from the plant — everything that was there, together. Broad-spectrum means full-spectrum with THC removed. Isolate means a single pure compound.

The extraction method affects the final product's potency, cannabinoid profile, and whether the entourage effect applies.

The Legal Picture

In the U.S., whether a cannabinoid product is legal comes down to:

Source plant: Hemp vs. marijuana is the key federal distinction
Total THC: Hemp is federally defined as cannabis with ≤0.3% Total THC on a dry-weight basis
The specific molecule: Some cannabinoids (like THCV) are federally controlled; others (like CBG, CBC) are not

A few things to know as a consumer:

Total THC = THC + (0.877 × THCA) — this is the formula on every legal product label
THCA hemp flower looks legal on paper but becomes THC when smoked — a gray area that's actively contested
Delta-8 THC is derived from hemp-derived CBD via chemical conversion; its legal status is disputed at the federal level
State laws vary considerably — what's legal in California may not be in Texas

For more detail on any specific cannabinoid, see the cannabinoid profiles.