What Is Full-Spectrum CBD? Plus Broad-Spectrum and Isolate

What is full-spectrum CBD?

Full-spectrum CBD is an extract of the hemp plant (Cannabis sativa L.) that keeps most of the compounds the plant makes, not just CBD. That usually means CBD and its acid form CBDA, minor cannabinoids such as CBG, CBN, CBC and CBDV, terpenes, and whatever THC the hemp and the process leave behind.

You can see this mix in lab work. When researchers at the University of Illinois separated a commercial "CBD oil" in a 2022 study (opens in a new tab), they found cannabigerol, cannabidivarin, cannabichromene, cannabinol and THC alongside the CBD. The same paper points out that terms like "full spectrum CBD" and "broad spectrum CBD" are used loosely, and that sellers don't have to disclose the full chemical content of a hemp preparation.

If you want the basics first, start with what CBD is and how it differs from THC.

Does full-spectrum CBD have THC?

Usually, yes, in small amounts. In a 2018 analysis of 14 CBD oils sold in Europe (opens in a new tab), 12 contained THC, mostly at low levels. One oil that its maker declared THC-free contained 0.35% THC.

A 2020 study of 29 CBD products sold in the UK (opens in a new tab) found measurable THC or cannabinol in 55% of them, with a mean THC content of 0.04%.

How much THC is legally allowed in a finished CBD product is a separate question, and the answer depends on the country (see the EU section below).

What is broad-spectrum CBD?

Broad-spectrum CBD starts as the same kind of extract, then goes through extra steps to remove THC while keeping some of the other cannabinoids and terpenes. How much of the original mix survives depends on the producer, so two broad-spectrum products can look quite different on a lab report.

Does broad-spectrum CBD have THC?

"THC removed" in practice means THC was below the laboratory's detection limit when that batch was tested. It does not mean the lab proved there was zero.

A small worked example shows why the limit matters. At a detection limit of 0.01%, a 500 mg capsule could contain up to 0.05 mg of THC and still be reported as "not detected". Labs with lower limits can see smaller amounts. So when you compare two "THC-free" products, compare their detection limits too.

What is CBD isolate?

CBD isolate is CBD purified away from the rest of the plant. The UK Food Standards Agency describes isolates simply as "highly purified CBD" (opens in a new tab). Producers get there with chromatography, crystallisation or distillation, and a 2021 review of hemp extraction (opens in a new tab) notes that these steps can reach purities above 99%.

Is CBD isolate THC-free?

Isolate is the type least likely to contain THC, because purification strips out the other cannabinoids. It is still a lab result, not a guarantee. The 2022 University of Illinois paper notes that CBD can convert to THC to a small extent during extraction and purification, so a batch test is still the only way to know.

CBD can also be made synthetically. In the UK, synthetic CBD is regulated the same way as plant extracts (opens in a new tab): as a novel food.

How the three types are made

All three start the same way. CBD is extracted from hemp flowers and leaves, most often with supercritical CO2 or ethanol. The crude extract is then winterised: dissolved in ethanol and chilled so plant waxes solidify and can be filtered out, as described in the 2022 Illinois paper (opens in a new tab).

From there the paths split:

• Full-spectrum extracts are usually refined or distilled but keep most of the plant's cannabinoids and terpenes.
• Broad-spectrum extracts go through an extra separation step, typically chromatography, to take THC out.
• Isolate is crystallised or otherwise purified until little but CBD is left.

A real example from Europe: an EFSA opinion published in September 2026 (opens in a new tab) describes a hemp extract made by supercritical CO2 extraction followed by winterisation, decarboxylation, purification and high-vacuum distillation. The finished extract was 57 to 65% CBD and 9 to 17% other cannabinoids.

Full-spectrum vs broad-spectrum vs isolate: the differences

Here is how the three compare on the points people ask about most:

• Full-spectrum: CBD plus other cannabinoids and terpenes. THC is usually present in small amounts.
• Broad-spectrum: CBD plus some other cannabinoids and terpenes. THC is reduced to below the lab's detection limit.
• Isolate: CBD on its own, purified to a high percentage. Other cannabinoids and THC are removed as far as the process allows.

What none of the three labels tells you: how much CBD is in a serving, whether the label matches the batch, or which lab tested it. Those answers are on the lab report.

Which is better: full-spectrum, broad-spectrum or isolate?

The idea that full-spectrum works "better" comes from the entourage-effect hypothesis, which researchers are still studying (see below). No CBD product of any extract type has an authorised health claim in the EU (see the EU register of nutrition and health claims (opens in a new tab)).

What you can compare is practical: whether you want to avoid THC as far as possible, how much documentation the seller gives you, and the format. If you are choosing between formats as well, see CBD oil vs capsules.

Is full-spectrum CBD stronger?

Not by definition. Strength is the amount of CBD per serving, given in milligrams on the label. A full-spectrum oil and an isolate capsule can contain exactly the same amount of CBD.

What is the entourage effect?

The term comes from a 1998 study by Raphael Mechoulam's group (opens in a new tab) in Jerusalem. In cell and mouse tests, the researchers found that two fatty-acid compounds the body makes, which had no activity on their own, increased the activity of the body's own cannabinoid 2-AG. They called this an "entourage effect". The study looked at the body's own compounds, not hemp extracts.

The phrase was later applied to plant extracts, with the idea that CBD may act differently alongside the plant's other compounds. Researchers have since tested parts of that idea:

• 2019 (opens in a new tab) and 2020 (opens in a new tab) cell studies looked at whether the most common hemp terpenes (six in the first, five in the second) change how THC, or in the second study CBD, acts at the CB1 and CB2 cannabinoid receptors. Neither found a change at those receptors, and the 2020 authors noted that an entourage effect could still work some other way.
• Three reviews, two from 2023 (Christensen et al. (opens in a new tab), Simei et al. (opens in a new tab)) and one from 2024 (André et al. (opens in a new tab)), looked at the published research as a whole. They describe the findings so far as mixed, and the effect, including any boost from terpenes, as not yet established.

For now, the entourage effect is a hypothesis rather than an established property of full-spectrum products.

Can full-spectrum CBD show up on a drug test?

It can. Standard urine drug tests look for THC-COOH, a breakdown product of THC, not for CBD. That makes the THC content of the product the thing that matters.

Two small US studies show the range:

• In a 2020 crossover study of 6 healthy adults (opens in a new tab), 100 mg doses of pure CBD (oral or vaporised) produced 1 positive screen across 218 urine samples, and none was confirmed positive. After vaporised CBD-dominant cannabis that also contained 3.7 mg of THC, four samples were confirmed positive.
• In a 2020 open-label trial (opens in a new tab), 14 adults used a full-spectrum product daily for four weeks, taking about 0.8 mg of THC a day on average. Seven of the 14 tested positive for THC-COOH.

Both studies were small, and test cut-offs vary between countries and employers. Broad-spectrum and isolate products lower the THC exposure, but they cannot remove the risk entirely, because labels are not always accurate (more on that below). If testing matters for your job or your licence, read how THC, roadside tests and EU rules apply to driving.

How much THC can a CBD product contain in the EU?

There is no single EU limit for THC in CBD products: the often-quoted 0.3% is a farm-payment rule for hemp plants under Article 4(4) of Regulation (EU) 2021/2115 (opens in a new tab), and our guide to THC limits and CBD rules in Europe, country by country covers the hemp seed limits, novel food status and national rules.

Is CBD isolate safer than full-spectrum?

No regulator has ranked the three types against each other for finished products. What exists are separate assessments, each with a narrow scope.

In its February 2026 statement (opens in a new tab) on CBD as a novel food, the European Food Safety Authority said the safety of CBD cannot be established for people under 25, during pregnancy or breastfeeding, or for people taking medication.

For a full-spectrum-type extract, EFSA's September 2026 opinion (opens in a new tab) on the hemp extract described above concluded that its safety cannot be established, after the applicant did not supply the data EFSA asked for.

For side effects and who should avoid CBD, see CBD side effects and liver risks.

Hemp seed oil is not CBD oil

Hemp seed oil is pressed from the seeds, while CBD is extracted from the flowers and leaves. The two are regulated differently. The UK FSA lists hemp seed oil as a traditional food (opens in a new tab) that doesn't need novel food authorisation, and EU law sets THC limits of 3.0 mg/kg for hemp seeds and 7.5 mg/kg for hemp seed oil, set by Commission Regulation (EU) 2022/1393, now in Regulation (EU) 2023/915 (opens in a new tab). A product sold as "hemp oil" may be either, so check whether the label gives a CBD amount in milligrams.

How to check which type a product really is

Label accuracy is a real problem in this market. A 2026 study (opens in a new tab) analysed 186 CBD and related cannabinoid oils sold in Europe over a decade. In 86 of 181 products (49%), the CBD content did not match the label, and one oil marketed as full-spectrum contained HHC, a semi-synthetic cannabinoid. In a 2024 German study (opens in a new tab), one of eight products claiming a full-spectrum hemp extract showed no cannabinoids other than CBD.

A certificate of analysis (COA) is how you check. Here is what to look at:

1. Match the batch. The batch or lot number on the pack should match the number on the COA. A report for a different batch tells you little.
2. Read the cannabinoid panel. A full-spectrum product should show measurable cannabinoids besides CBD, usually including some THC. Broad-spectrum should show other cannabinoids but THC as "ND" (not detected). An isolate should show CBD and little else.
3. Find the detection limit. "ND" means below the limit of detection (LOD) or quantification (LOQ). The report should state it, for example 0.01%. Use it to work out the most THC a serving could contain unreported.
4. Check what was tested. If terpenes weren't tested, the report can't confirm a "full-spectrum" or "broad-spectrum" claim on its own.
5. Check who tested it and when. Look for an independent laboratory, the test method, the sample date and, ideally, accreditation to ISO/IEC 17025 (opens in a new tab), the international standard for testing labs.

If the seller can't give you a COA for your batch, you can't verify the spectrum claim.

Frequently asked questions