Cannabis oil is a concentrated liquid extract made from the cannabis plant, containing active compounds called cannabinoids that interact with your body’s own signaling system. The term covers a wide range of products, from hemp-derived CBD oils with virtually no intoxicating effects to high-potency THC oils that produce a strong “high.” What you’re actually getting depends entirely on the plant source, the extraction method, and the cannabinoid profile inside the bottle.
Types of Cannabis Oil
The cannabis oil market includes several distinct products that are often confused with one another. Understanding the differences matters because the effects, legality, and uses vary dramatically between them.
Full-spectrum CBD oil is made from the stalks, leaves, and flowers of hemp plants. It contains CBD along with all the other naturally occurring compounds in the plant, including a small amount of THC. Broad-spectrum CBD oil goes through additional processing to remove the THC while keeping other plant compounds intact. CBD isolate oil contains only pure CBD, with everything else stripped away.
THC-dominant cannabis oil is extracted from marijuana plants and contains high concentrations of THC, the compound responsible for intoxication. These products are only available through state-licensed dispensaries where cannabis is legal. Hemp seed oil is something else entirely. It comes from the seeds of the cannabis plant, which contain no CBD and no THC. Hemp seed oil is a nutritional product rich in omega-3 and omega-6 fatty acids, B vitamins, and vitamin D, but it has none of the cannabinoid effects people associate with cannabis oil.
How Cannabis Oil Works in the Body
Your body runs its own cannabinoid signaling network called the endocannabinoid system. This system uses two main types of receptors, CB1 and CB2, along with molecules your body produces naturally to activate them. CB1 receptors are among the most common receptors in the brain, spread across areas that control cognition, memory, mood, appetite, and sensory responses. CB2 receptors are found primarily in immune cells and peripheral tissues.
THC plugs directly into CB1 receptors, which is why it produces psychoactive effects. It also triggers anti-nausea, anti-inflammatory, and pain-relieving responses. CBD works differently. Rather than binding directly to cannabinoid receptors, it acts as a kind of dimmer switch, modulating how strongly those receptors respond to other signals. CBD also interacts with serotonin receptors and pain-sensing receptors throughout the body, which helps explain its wide range of reported effects.
Full-spectrum oils contain additional plant compounds like beta-caryophyllene (which binds to CB2 receptors and may reduce anxiety and pain), limonene (an antioxidant), cannabichromene (linked to pain relief), and cannabigerol (which shows anti-inflammatory and neuroprotective properties). Some researchers believe these compounds work better together than in isolation, a concept sometimes called the “entourage effect.”
THC and CBD Concentrations
Cannabis oils vary enormously in potency. Hemp-derived CBD oils sold legally at the federal level must contain no more than 0.3% THC on a dry weight basis. Products designed for medical use in clinical research typically contain less than 10% THC, and several pain studies found that concentrations as low as 1 to 3% THC provided meaningful relief.
The recreational market tells a very different story. Most products in legal state dispensaries contain more than 15% THC, with many exceeding 20%. These concentrations are well above what clinical research has tested for medical benefit and are associated with strong intoxicating effects. Products marketed for medical purposes tend to have more balanced ratios, with THC averaging 6 to 9% and CBD averaging 6 to 11%.
How Cannabis Oil Is Made
Three main extraction methods are used to pull cannabinoids out of plant material, and the method affects the purity of the final product.
- Ethanol extraction uses food-grade alcohol as the solvent. It evaporates cleanly without leaving residues behind, and the resulting oil can match the purity of any other method when proper protocols are followed. It sometimes pulls out unwanted plant compounds, but these are easy to filter out in post-processing.
- CO2 extraction uses pressurized carbon dioxide to separate cannabinoids from plant material. The raw extract is high-purity but contains fats and lipids that make it unusable in finished products. It still needs to be refined with ethanol or another solvent before it’s ready for consumers.
- Hydrocarbon extraction uses butane or propane. While effective at pulling out cannabinoids, this method can leave carcinogenic solvent residues in the finished product, making it the least desirable option for health-conscious consumers.
How You Take It
Cannabis oil is sold as tinctures (dropper bottles), capsules, edibles, vape cartridges, and topical products. Sublingual drops, placed under the tongue, are widely marketed as faster-acting than swallowed capsules. However, a pharmacokinetic study in healthy males found that sublingual CBD drops and gelatin capsules produced nearly identical absorption profiles. Peak blood concentrations were comparable (28.0 vs. 24.0 ng/mL), and both reached peak levels at about four hours. The likely explanation is that most of the oil placed under the tongue gets swallowed before it can absorb through the mouth’s lining.
Inhaled cannabis oil (through vaporizers) reaches the bloodstream much faster, typically within minutes, but the effects also wear off sooner. Oral forms take longer to kick in but produce effects that last several hours. Topical products are designed for localized relief and generally don’t produce systemic effects.
FDA-Approved Cannabis Medications
The FDA has not approved cannabis itself for any medical condition. It has, however, approved one cannabis-derived drug: Epidiolex, a purified CBD product used to treat seizures in patients two years and older with Lennox-Gastaut syndrome or Dravet syndrome, two severe forms of epilepsy.
Three synthetic cannabinoid drugs also have FDA approval. Two of them, Marinol and Syndros, are used for chemotherapy-related nausea and appetite loss in AIDS patients. A third, Cesamet, has a chemical structure similar to THC and is also approved for chemotherapy-induced nausea. Every other cannabis oil product on the market is sold without FDA approval for treating any disease.
Safety and Drug Interactions
Cannabis oil is generally well tolerated, but both CBD and THC can interfere with how your liver processes other medications. Your liver uses a family of enzymes to break down most drugs, and cannabinoids can slow certain enzymes down. The most significant interaction involves an enzyme called CYP2C9, which was inhibited by nearly all cannabinoids tested at concentrations that could realistically occur in the body. This enzyme processes several common medications, including certain blood thinners and anti-inflammatory drugs.
Other liver enzymes were either unaffected or only partially inhibited, meaning the risk of interactions is concentrated rather than universal. If you take medications with a narrow safety margin, particularly blood thinners, anti-seizure drugs, or certain heart medications, the potential for cannabis oil to alter their effectiveness is real and worth discussing with a pharmacist or prescriber.
Legal Status
The 2018 Farm Bill removed hemp from the list of controlled substances at the federal level, making hemp-derived products legal as long as they contain no more than 0.3% THC on a dry weight basis. Cannabis oil with higher THC concentrations remains a controlled substance under federal law, though individual states have their own medical and recreational cannabis programs. The result is a patchwork: a CBD oil with 0.2% THC is federally legal and widely available online, while a cannabis oil with 5% THC requires a state-issued medical card or a visit to a licensed dispensary, depending on where you live.