CBD oils are liquid extracts made from hemp plants that contain cannabidiol, one of over 100 naturally occurring compounds found in cannabis. Unlike THC, the compound responsible for marijuana’s mind-altering effects, CBD does not produce a high. These oils are typically taken under the tongue, added to food, or applied to the skin, and they’ve become one of the most popular wellness products in the United States since hemp was federally legalized in 2018.
How CBD Differs From THC
Cannabis plants produce two main active compounds: THC and CBD. Both interact with your body’s endocannabinoid system, a network of receptors involved in regulating pain, mood, sleep, and immune function. But they do so in very different ways. THC binds directly to receptors in the brain that control perception and mood, which is why it causes euphoria. CBD doesn’t bind to those same receptors in the same way, so it doesn’t alter your mental state.
Hemp and marijuana are both varieties of Cannabis sativa, but hemp contains no more than 0.3% THC by dry weight, the federal legal threshold established by the 2018 Farm Bill. CBD oils sold commercially are derived from hemp, keeping THC content at trace levels far too low to cause intoxication.
Three Types of CBD Oil
Not all CBD oils contain the same mix of plant compounds. Cannabis plants produce over 80 active compounds, including cannabinoids, terpenes (aromatic molecules), and flavonoids. How many of those end up in the final product depends on how it’s processed.
- Full-spectrum CBD includes all parts of the cannabis plant: CBD, minor cannabinoids, terpenes, and up to 0.3% THC. Some users prefer this type because of the “entourage effect,” the idea that these compounds work better together than in isolation.
- Broad-spectrum CBD retains most of those plant compounds but with THC reduced to negligible levels. It’s a middle ground for people who want the broader plant profile without any THC exposure.
- CBD isolate is pure CBD with no other cannabinoids, terpenes, or THC. It’s the most refined form, often chosen by people who are drug tested or sensitive to other cannabis compounds.
How CBD Oil Is Made
The most widely used extraction method pushes carbon dioxide through hemp plant material at high pressure and temperature, a process called supercritical CO2 extraction. Under these conditions, CO2 behaves like both a liquid and a gas, dissolving the plant’s active compounds and pulling them out. When the pressure drops, the CO2 evaporates completely, leaving behind an extract with no solvent residue. This is a significant advantage over methods that use petrochemical solvents, which can leave trace contaminants in the finished product.
By adjusting the pressure and temperature during extraction, manufacturers can influence the color, texture, and flavor of the oil. To produce CBD isolate with 99% purity, companies pair CO2 extraction with an additional purification step called chromatography, which separates CBD from every other compound in the extract.
What CBD Is Approved to Treat
The FDA has approved one CBD-based prescription medication for three specific seizure disorders: Lennox-Gastaut syndrome, Dravet syndrome, and tuberous sclerosis complex. These are severe, often childhood-onset conditions that don’t always respond well to conventional treatments. This remains the only FDA-approved medical use for CBD.
Beyond seizures, people use over-the-counter CBD oils for pain, anxiety, insomnia, and inflammation. While preliminary research exists for some of these uses, none has reached the level of evidence required for FDA approval. The lack of regulation around non-prescription CBD products means the quality, potency, and safety of what you buy can vary enormously.
Drug Interactions and Safety Concerns
CBD is processed by the same family of liver enzymes that break down a wide range of common medications. When CBD occupies those enzymes, other drugs can’t be metabolized as efficiently, causing their levels in your blood to rise. This is essentially the same issue grapefruit causes with certain medications, but CBD’s effect can be more pronounced at higher doses.
The drug classes most affected include blood thinners, beta blockers, antidepressants, and antipsychotic medications. Research has shown that CBD doses between 200 and 800 mg per day significantly increased blood levels of certain antidepressants in patients taking them. Anti-seizure medications like clobazam and valproate also interact with CBD. When combined with valproate in particular, CBD has been linked to a higher risk of elevated liver enzymes, a sign of liver stress.
If you take any prescription medication, this is worth a conversation with your pharmacist or doctor before adding CBD oil to your routine. The interaction potential is real and dose-dependent.
How to Evaluate CBD Oil Quality
Because the FDA doesn’t regulate CBD supplements the way it regulates drugs, quality control falls largely on the consumer. The most reliable tool you have is a Certificate of Analysis (COA), a third-party lab report that reputable brands make available on their website or packaging.
A good COA covers several things. The cannabinoid potency section tells you how much CBD is actually in the product, measured in milligrams per gram or per serving, and whether the THC content falls within the legal 0.3% limit. Full-spectrum products should show trace amounts of THC alongside minor cannabinoids like CBG and CBC. Isolate products should show CBD only.
The contaminant panels are equally important. Labs screen for four major groups: pesticide residues from farming, residual solvents left over from extraction, heavy metals (arsenic, lead, cadmium, and mercury, which hemp readily absorbs from soil), and microbial impurities like mold and bacteria. Each result is compared against regulatory action limits. You want to see “Pass” across every category with actual numerical data, not just a checkmark. If a brand doesn’t provide a COA, or the report is outdated or missing panels, treat that as a red flag.
Legal Status
The 2018 Farm Bill removed hemp from the Controlled Substances Act, making hemp-derived CBD legal at the federal level as long as the plant and its products contain no more than 0.3% THC on a dry weight basis. This opened the door to the CBD market that exists today.
State laws, however, vary. Some states restrict CBD in food and beverages, others require specific labeling, and a few still treat all cannabis-derived products with more scrutiny. The FDA has also stated that adding CBD to food, dietary supplements, or animal feed remains technically illegal under federal food and drug law, though enforcement has been minimal. The practical result is a patchwork of rules that differ depending on where you live and what type of product you’re buying.