CBD basics
What is CBD and how is it made from hemp?
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CBD (cannabidiol) is one of more than 100 cannabinoids in Cannabis sativa, and it does not produce intoxication the way THC does. Hemp is cannabis with no more than 0.3 percent delta-9 THC by dry weight under federal law. Processors extract CBD from hemp flower, then refine it into full-spectrum, broad-spectrum or isolate forms.
CBD is a molecule, hemp is a plant, and the two get confused constantly. Start with the plant, then follow the molecule from the field to the bottle.
What is CBD, chemically?
Cannabidiol is a 21-carbon compound made by the cannabis plant. The World Health Organization's 2018 critical review describes it as formed "following decarboxylation from a cannabidiolic acid precursor," and notes it can also be produced synthetically. In the living plant the molecule exists mostly as CBDA, the acid form. Heat or time removes a carboxyl group and leaves CBD.
CBD is one of a large family. NCCIH counts THC and CBD as the two main cannabinoids and notes that more than 100 other cannabinoids have been identified. Unlike THC, CBD does not produce the intoxication that cannabis is known for. The WHO review found that in people CBD shows no effects indicative of abuse or dependence potential.
How is hemp different from marijuana?
Botanically they are the same species, Cannabis sativa L. The difference is a legal line drawn at THC content. Federal law defines hemp as the plant and "all derivatives, extracts, cannabinoids, isomers, acids, salts, and salts of isomers" with a delta-9 THC concentration of not more than 0.3 percent on a dry weight basis. Anything above that line is marijuana under the Controlled Substances Act.
Hemp bred for CBD production runs high in CBD and low in THC. The Merck Veterinary Manual puts typical hemp CBD content at 0.3 to 4.2 percent, while plants bred for high THC can carry CBD as low as 0.15 percent. That is why CBD products come from hemp and not from the dispensary supply chain.
The federal definition is changing. The amended text of 7 U.S.C. 1639o moves to a total THC standard that counts THCA, and it excludes final products with more than 0.4 mg of total THC per innermost container. Most of that amendment takes effect December 11, 2026.
How does CBD get from the plant to a bottle?
The flower is harvested, dried and milled. A processor then pulls the cannabinoids out of the plant material with a solvent. Supercritical CO2 and food-grade ethanol are the two common choices; both leave a crude oil that contains cannabinoids, terpenes, waxes and chlorophyll. Winterization (chilling the oil and filtering out waxes) and decarboxylation (heating to convert CBDA into CBD) come next.
From there the path splits. A full-spectrum oil stops after filtration, keeping the full cannabinoid profile including trace THC. A broad-spectrum oil runs through chromatography to remove THC. An isolate goes further, crystallizing CBD into a powder that is a single molecule. Each step should show up on the certificate of analysis as a change in the cannabinoid table.
The finished oil is diluted into a carrier such as MCT oil, hemp seed oil or olive oil, because CBD is fat-soluble. That matters for absorption. A systematic review of human pharmacokinetics found oral CBD reaches peak blood levels in roughly 1 to 4 hours and that taking it with food raised exposure about 5-fold in one of the included studies.
What does FDA say CBD is, legally?
FDA's position is narrow and specific. The agency has approved one purified CBD drug, Epidiolex, for prescription use. For everything else, FDA states that THC and CBD products are excluded from the dietary supplement definition and that adding CBD to food in interstate commerce is a prohibited act. FDA has also not approved cannabis for any use in animals. Hemp-derived CBD is legal to grow and sell as hemp; what sellers may say about it is where the agency draws its lines.
This page is general information, not personalized guidance.
General information, not personalized guidance.
Sources
- 7 U.S. Code 1639o - Definitions Cornell Law School, Legal Information Institute (accessed 2026-10-13)
- FDA Regulation of Cannabis and Cannabis-Derived Products, Including Cannabidiol (CBD) U.S. Food and Drug Administration (accessed 2026-10-13)
- Cannabis (Marijuana) and Cannabinoids: What You Need To Know NCCIH, National Institutes of Health (accessed 2026-10-13)
- Cannabidiol (CBD) Critical Review Report World Health Organization, Expert Committee on Drug Dependence (accessed 2026-10-13)
- Toxicosis in Dogs and Cats From Cannabidiol (CBD) Merck Veterinary Manual (accessed 2026-10-13)
- A Systematic Review on the Pharmacokinetics of Cannabidiol in Humans Frontiers in Pharmacology, via PubMed Central (accessed 2026-10-13)
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