THC stands for tetrahydrocannabinol, and CBD stands for cannabidiol. Both are cannabinoids, the chemical compounds made by cannabis plants, and both interact with the human endocannabinoid system. THC causes intoxication; CBD does not.
how many cannabinoids are in cannabis
What does THC stand for?
THC is short for tetrahydrocannabinol. The main version found in cannabis is delta-9-tetrahydrocannabinol, the molecule behind the high. Chemists Raphael Mechoulam and Yehiel Gaoni isolated it at Hebrew University in Jerusalem in 1964.
complete list of thc and cbd compounds
- Full name: delta-9-tetrahydrocannabinol
- Chemical formula: C21H30O2
- Main receptor targets: CB1 and CB2
- Psychoactive: yes
- Plant precursor: THCA (tetrahydrocannabinolic acid)
What does CBD stand for?
CBD is short for cannabidiol. Roger Adams isolated it from hemp at the University of Illinois in 1940, and Mechoulam's group mapped its structure in 1963. It does not produce a high.
- Full name: cannabidiol
- Chemical formula: C21H30O2 (same formula as THC, different atom arrangement)
- Main receptor targets: weak pull toward CB1 and CB2, plus indirect pathways
- Psychoactive: no
- Plant precursor: CBDA (cannabidiolic acid)
Are THC and CBD the same thing?
No. They are isomers, which means they share one molecular formula but differ in how the atoms are arranged. That small structural difference is why THC fits CB1 receptors and CBD does not.
cannabis cannabinoids list and effects
THC vs CBD: how do they differ?
- High: THC causes it. CBD does not.
- Receptor action: THC binds CB1 and CB2 receptors. CBD works through other routes, including enzymes and receptor modulation.
- Plant source: Marijuana-type cannabis holds more THC. Hemp holds more CBD.
- Federal status: Hemp with 0.3% THC or less is legal in the US. Cannabis above that line is a Schedule I substance under federal law.
- Reported uses: People take THC for pain, nausea, appetite, and sleep. People take CBD for anxiety, inflammation, and certain seizures (as a prescription drug).
Where do THC and CBD come from in the plant?
Fresh cannabis holds almost no THC or CBD in finished form. The plant makes acidic versions, THCA and CBDA, and those convert when heat, light, or time removes a carbon dioxide group. The reaction is called decarboxylation.
This is why raw cannabis flower does not get you high, while smoked, vaped, or baked cannabis does. Hemp strains are bred for CBDA, and THC strains are bred for THCA.
How do THC and CBD work in the body?
THC attaches to CB1 receptors, which sit in the brain and nervous system, and to CB2 receptors, found in immune tissue. The result is the high, along with hunger, drowsiness, dry mouth, and dulled pain signals.
CBD shows little pull toward those receptors. It slows FAAH, the enzyme that breaks down your own endocannabinoids, and acts as a negative allosteric modulator at CB1, meaning it changes how the receptor responds without switching it on.
Does CBD block the effects of THC?
Some users say CBD softens the edge of a THC high, and early studies suggest it may ease THC-related anxiety and memory trouble. Evidence is mixed, and the ratio of CBD to THC in the product matters. A 1:1 gummy behaves nothing like a high-CBD, low-THC tincture.
What forms do THC and CBD come in?
- Flower and pre-rolls
- Tinctures and oils
- Gummies, chocolates, and drinks
- Capsules and softgels
- Topicals, balms, and patches
- Vapes and concentrates
THC and CBD doses are listed in milligrams on the package. Edibles take 30 to 120 minutes to hit because the compounds pass through the liver first. Inhaled products act in minutes.
How do you read a THC and CBD label?
Look for milligrams of THC, milligrams of CBD, serving size, and total cannabinoids per package. A label that says 100 mg CBD might mean 100 mg per bottle or 100 mg per dropper, so check the serving line.
In legal US markets, products also carry a batch number tied to a certificate of analysis (COA) from a third-party lab. The COA lists cannabinoid content and tests for pesticides, mold, and heavy metals.
Frequently asked questions about THC and CBD
Is hemp oil the same as CBD oil?
No. Hemp seed oil is pressed from seeds and holds no cannabinoids. CBD oil is extracted from hemp flowers and leaves, so it contains cannabidiol.
What does full-spectrum mean?
Full-spectrum means the extract keeps the plant's cannabinoids, terpenes, and other compounds, including up to 0.3% THC. Broad-spectrum keeps most compounds but strips the THC. Isolate is CBD alone.
Can you take THC and CBD together?
Yes, and many legal products blend them. The mix is often called the entourage effect, though research on how much the blend adds is still thin. Start low with any new ratio.
Will CBD show up on a drug test?
Most drug screens look for THC metabolites, not CBD. Full-spectrum products with THC can trigger a positive result, so choose THC-free options if you get tested.
Legal status of THC and CBD in the US
Federal law splits cannabis by THC content. Hemp, defined as cannabis with 0.3% THC or less on a dry weight basis, is legal under the 2018 Farm Bill. Cannabis above that line stays illegal under federal law.
State rules differ. Some states allow medical use only, some allow adult use, and a few allow no THC at all. Hemp-derived CBD is legal in most states but not all. Check your state before you buy.