Between 90 and 99 per cent lies the difference you pay for
The difference between the two is not a degree of purity but a decision about what is allowed to stay. Nine percentage points separate them, and in those nine points sits everything that is not CBD.
Both are highly purified products from the same chain. The extra step an isolate takes removes exactly what a premium is paid for on a distillate.
This page explains what the remaining points contain, how the two differ on the certificate, and when each is objectively the right choice.
⚠️ Scope. This page describes processes and what can be verified from documents. It does not describe what a product does to a person, gives no amounts, and does not replace a healthcare professional.
What a distillate is
The purity range
Around ninety per cent, sometimes a little more depending on how the process was run. The remainder is not impurity at all, it is plant content.
How it arises
Through vacuum distillation, where components are separated by their boiling behaviour. The vacuum part is decisive.
Why vacuum
Because at normal pressure cannabinoids only boil at temperatures that would destroy them outright. Reduced pressure lowers the boiling point considerably.
What is removed
Waxes, chlorophyll residues, part of the terpenes and the less volatile components. What remains is a thick, golden mass that pours slowly at room temperature.
What an isolate is
The purity range
Ninety-nine per cent and above. Practically a single substance, with no notable remainder.
How it arises
Through crystallisation from a distillate, or through chromatographic separation. Both routes reach much the same result by different means.
What it looks like
A white, crystalline powder with no smell and no taste. It suggests no plant material and would not be distinguishable by eye from any other white powder.
What is removed
Everything but the target substance. Minor cannabinoids, remaining terpenes and pigments — entirely, and with no way of putting any of it back afterwards.
What sits in the nine points
Minor cannabinoids
CBG, CBC, CBN and others in small quantities. They come from the same plant, are still present in the distillate, and show as separate lines on the report.
Remaining terpenes
A small share survives distillation. It carries the smell a distillate still has.
Other plant compounds
Flavonoids and the like, in very small amounts. Hard to quantify, they rarely appear on a report and can therefore be neither confirmed nor refuted.
Why this is the whole argument
Because that fraction is the reason for the price difference. Whoever considers it valuable pays for a distillate.
How the two differ on the certificate
On a distillate
A high CBD value and, beside it, several small values for other cannabinoids. A profile with several lines.
On an isolate
A very high CBD value and, below it, practically zeros. A very characteristic, bare picture.
What both need
A solvent panel, because both routes use one. And a contaminant panel, because both concentrate heavily.
What the report does not show
Terpenes, unless a separate panel was commissioned. Precisely the fraction at issue is usually missing.
Why an isolate contains no THC
Because the separation is complete
At this degree of purity practically everything else has been removed, THC included. It is the cleanest answer to the threshold question.
Why that is a selling point
Because it removes legal uncertainty. For some applications that is the decisive point.
What it costs
The entire rest of the plant. An isolate is a substance, not an extract.
Why some want that anyway
Because it is exactly calculable. Whoever wants to work in a precise quantity of a substance has an easier task.
Why a distillate can still contain THC
Because the separation is incomplete
Ninety per cent means ten per cent of something else, and that can include THC. The value must be quantified.
Why the sum matters particularly here
Because a concentrate of this purity carries high absolute values. A small percentage here is a large quantity.
How to calculate
Delta-9-THC plus THCA multiplied by 0.877. The factor comes from THCA losing a CO₂ molecule on heating and therefore becoming lighter.
Why distillation changes little
Because CBD and THC have similar boiling points. They separate poorly by distillation.
The price difference and what it measures
The extra process step
An isolate requires one more purification. It costs equipment, time and yield.
The yield
Every step costs material. An isolate is dearer per gram because less of it comes out.
The market position
Distillates carry the premium for closeness to full spectrum, isolates the premium for purity and predictability. Two different arguments.
What it does not measure
The content of the target substance. On the isolate it is higher, which makes the division all the more important.
When each is objectively right
When compliance is the main concern
Then the isolate. It takes the threshold question off the table entirely.
When aroma matters
Then the distillate, or better still a less purified product. Every step costs aromatic compounds.
When precise dosing matters
Then the isolate. A pure substance can be weighed exactly.
When full spectrum is wanted
Then neither. Both are purified, and a full spectrum sits further up the chain.
What “broad spectrum” is in this
What the term means
A product with the accompanying compounds but without THC. It sits between the two.
How it arises
Through targeted removal of THC from a distillate, usually chromatographically. The rest is retained.
Why it is expensive
It requires an additional, selective step. Of the three products it is the most demanding.
How to recognise it
On the certificate: several cannabinoid lines as with a distillate, but THC close to the detection limit. A combination that does not arise on its own.
The regulatory view
Concentration travels along
Both products are highly concentrated. What went unnoticed in the plant is a notable quantity here.
Why the isolate is the exception
Because at that purity practically nothing else remains. It is the only case where enrichment solves the problem itself.
What holds for distillates
The sum must be quantified and checked. A report without a THCA value is not enough here.
Where to read the rules
On the page covering the legal position in the UK, with the corresponding official sources.
How short-path distillation runs
The preparation
The extract must be winterised and decarboxylated. Waxes interfere, and acid forms distil differently from neutral ones.
The first pass
At low temperature the light fractions come over, mainly remaining terpenes and water. They are discarded or collected separately.
The second pass
At higher temperature the main fraction follows. That is the distillate proper.
The residue
Heavy components stay behind in the sump, including pigments and degradation products. They make up most of what was removed.
Why “short path” is in the name
The vapour’s route
Between evaporation and condensation there are only a few centimetres. The setup is deliberately compact.
Why that is necessary
Because a longer path means more time at high temperature. Cannabinoids degrade under it.
What the short path achieves
It cuts residence time to seconds. Thermal stress falls accordingly.
What follows from that
That the design of the apparatus decides quality here, not just the temperature. Two installations at the same setting give different results.
How an isolate crystallises
The starting point
A distillate, dissolved in a suitable solvent. Without that intermediate step it is not possible.
The sequence
Slow cooling until the target substance crystallises out. Everything else stays in solution.
Why it works
Because CBD crystallises more readily than the accompanying compounds under usual conditions. A fortunate circumstance on which the whole process rests.
The washing
The crystals are rinsed to remove adhering residues. Every wash raises purity and lowers yield.
Why both need a contaminant panel
Because the enrichment is enormous
From plant to isolate there are several purification steps. Whatever is not removed sits strongly concentrated at the end.
What travels and what does not
Heavy metals do not follow the boiling behaviour of cannabinoids and mostly stay behind. Some pesticides, however, distil along.
Why that is counter-intuitive
Because a highly purified product seems clean. Purity here refers to cannabinoid content, not to the absence of foreign substances.
What follows from that
That a ninety-nine per cent isolate still needs a full panel. The two figures measure different things.
Why an isolate processes differently
It is a solid
A powder can be weighed, mixed and stored like any other raw material. A distillate is thick and sticky.
It is taste-neutral
Without terpenes there is nothing to mask. For products with their own flavour profile that is an advantage.
It is identical across batches
Two isolates from different manufacturers are near-indistinguishable. On distillates the profile varies with the harvest.
What that means for industry
Predictability. It is why a considerable share of finished goods is built on isolate, even where the packaging suggests otherwise.
Why the terpene panel is almost always missing
Because it is commissioned separately
A standard report covers cannabinoids, contaminants and solvents. Terpenes are a distinct item with their own cost.
Why that matters precisely here
Because it is exactly the fraction that justifies the price difference. Whoever pays for closeness to full spectrum pays for a line absent from the report.
What you get instead
A cannabinoid profile showing the minor cannabinoids. It is a substitute measure, and a usable one.
What a careful supplier does
Has it measured and includes it. It is the figure that distinguishes their product from an isolate, and the only one that quantifies it.
What the percentage figure actually means
It refers to mass
Ninety per cent means nine hundred milligrams per gram. At these purities the arithmetic is unusually simple.
Why it can still mislead
An isolate at ninety-nine per cent costs more per gram but may cost less per milligram. The division decides, not the percentage.
Why the comparison pays here
Because the price spread between the products is wide and the percentages sit close together. A small difference in the numerator, a large one in the denominator.
What you need for it
The price, the weight and the declared content. Three figures that should appear on any packaging.
Why the names are not protected
None of the three is defined
Distillate, isolate and broad spectrum have no legal definition in this category. No body sets a threshold for any of them.
What that permits
An eighty-five per cent product can be sold as a distillate, and a ninety-seven per cent one as an isolate. Nothing stops either.
Why it rarely matters in practice
Because the certificate settles it regardless. The profile on the report is harder to argue with than a word.
What to do about it
Read the lines, not the label. It takes ten seconds and removes the question entirely.
What decarboxylation does before distillation
What it changes
Heat converts the acid forms into the neutral ones. CBDA becomes CBD, THCA becomes THC.
Why it is done first
Because the two forms distil at different temperatures. Separating them mid-process complicates everything.
What it does not change
The sum. The factor of 0.877 exists precisely because the conversion loses mass without losing substance.
Why it matters for the certificate
A decarboxylated product shows most of its content as neutral forms. That is expected, not a red flag.
Where the crystallisation route can fail
If the distillate is not pure enough
Too many accompanying compounds and the target substance will not crystallise cleanly. The starting purity sets the ceiling.
If cooling is too fast
Rapid cooling traps impurities inside the crystals. Slow is better, and slow costs time.
If the washing is skipped
Adhering residues stay on the crystal surfaces. Purity falls short of what the process could reach.
What that means for price
A very high purity isolate reflects patience as much as equipment. The extra points cost disproportionately more than the first ninety.
A short glossary
Distillate
A product purified by vacuum distillation, around ninety per cent target substance. The rest is minor cannabinoids and remaining terpenes — and because CBD and THC have similar boiling points, THC can sit in there too.
Isolate
A white crystalline powder at ninety-nine per cent and above. Odourless, taste-neutral and near-identical across batches and manufacturers, which is why so much finished product is built on it — and why the packaging so rarely says so.
Broad spectrum
A product with the accompanying compounds but without THC, produced by an additional selective step. Recognisable by several cannabinoid lines with THC near the detection limit — a combination that never arises on its own, which makes it one of the few designations the paperwork can confirm.
Short-path distillation
A setup where only a few centimetres separate evaporation from condensation. The short residence time keeps cannabinoids from degrading thermally — which is why the design of the apparatus decides the result as much as the temperature setting does.
Sump residue
What stays behind after distillation: pigments, degradation products and a measurable share of cannabinoid content. At scale it justifies a second pass; in small operations it is discarded.
Batch
One production run. The certificate applies to the batch, not to the product designation — and since none of the three names is protected, the profile on the report decides rather than the word on the packaging.
The five checks that apply to any product
The batch certificate
Request it with the number printed on the packaging. A general document for the product line does not cover this batch, and those differences are exactly what it should record.
Total THC
Delta-9-THC plus THCA multiplied by 0.877, because THCA becomes THC under heat and the limit applies to the sum, not to either value alone.
Price per milligram
A division, not an opinion. The only figure that makes two products comparable, whatever the format, purity and pack size.
The claims
Without an authorisation number in the EU Register these are assertions, not data — and for cannabidiol that register contains no authorised entry to this day.
The seller’s details
Company name, address and contact. Without them there is also no counterparty to turn to if something turns out to be wrong.
How this connects to the rest
With winterisation
It is the precondition. Without it the wax content interferes considerably with distillation.
With the threshold question
The isolate is one of the three routes to solving it. This page describes what it costs.
With the extraction processes
Both products can come from any extraction route. Purification comes afterwards.
With the certificate
Everything ends there: batch number, date, cannabinoids, contaminants, solvents. The designation itself appears on no report.
What this is for in practice
Facing a certificate
Count the cannabinoid lines. A single one indicates an isolate, several a distillate.
Facing two offers
Work out the price per milligram. An isolate with a higher percentage can be cheaper or dearer per milligram.
If you simply want to understand
That nine percentage points make the whole difference, and that they contain everything which is not the target substance.
What this page publishes
Processes, verifiable documents and arithmetic. No promises of effect — for that, the EU Register contains no authorised entry.
Frequently asked questions
What is the difference between distillate and isolate? About nine percentage points, and they contain everything that is not CBD: minor cannabinoids, remaining terpenes and other plant compounds. An isolate holds none of it.
Is an isolate better because it is purer? It is purer and poorer at once. For exact dosing and legal certainty it is the right product; for aroma and closeness to full spectrum it is not.
Can a distillate contain THC? Yes. Ninety per cent target substance means ten per cent of something else, and CBD and THC separate poorly by distillation. The sum must be quantified.
What is broad spectrum? A product with the accompanying compounds but without THC, produced by an additional selective step. Of the three variants it is the most demanding and the most expensive.
Why is distillation done under vacuum? Because at normal pressure cannabinoids only boil at temperatures that would destroy them. Reduced pressure lowers the boiling point enough to make the step possible at all.
Does a 99 per cent isolate still need a contaminant panel? Yes. Purity refers to cannabinoid content, not to the absence of foreign substances — some pesticides distil along, and the enrichment across several steps is enormous.
Why is so much finished product built on isolate? Predictability. A powder weighs, mixes and stores like any raw material, is taste-neutral, and is near-identical from batch to batch.
Why does the terpene panel almost never appear? Because it is commissioned separately and costs extra. It is exactly the fraction that justifies the price difference, and exactly the line that is missing.
Are the three names legally defined? No. None of them has a threshold set by any body in this category. An eighty-five per cent product can be called a distillate — which is why the certificate settles it and the label does not.
Why is decarboxylation done before distillation? Because acid and neutral forms distil at different temperatures, and separating them mid-process complicates everything. It shifts the distribution without changing the sum.
What is left in the sump? Pigments, degradation products and a measurable share of cannabinoid content. At scale it justifies a second distillation; in small operations it is discarded.
Which is cheaper per milligram? It depends. An isolate costs more per gram but holds more per gram, so the higher content can outweigh the higher price. Only the division answers it.
Why do the last purity points cost disproportionately more? Because they demand slow cooling and repeated washing, both of which cost time and yield. The first ninety per cent is far easier to reach than the last nine.
What the sump residue contains
The heavy fraction
Pigments, degradation products and anything that boils above the target range. It is dark and viscous.
Some cannabinoid content
Not everything comes over in the passes. A measurable share stays behind.
Why it is sometimes reprocessed
At scale the residual content justifies a second distillation. In small operations it is discarded.
What that says about yield
Each distillation loses material to the sump. It is one of the reasons a distillate costs more per gram than the extract it came from.
How the three products sit on price
The crude extract
Cheapest per gram and lowest in purity. Everything downstream starts here.
The distillate
Middle of the range. It carries the cost of one purification and the premium for retained accompanying compounds.
The isolate
Highest per gram, because it carries two purifications and the lowest yield of the three.
Why per-milligram reverses this sometimes
Because the isolate’s higher content can outweigh its higher price. The only way to know is the division.
What a buyer should ask for each
For a distillate
The full cannabinoid profile, so the accompanying compounds can be seen. That is what is being paid for.
For an isolate
The purity figure and the contaminant panel. The profile will be bare by design.
For broad spectrum
Both, plus the THC value with its detection limit. The claim rests on that number.
For all three
Batch number, date and solvent panel. The constants that do not depend on the designation.
Why isolate dominates finished goods
It behaves like an ingredient
Weighable, mixable, storable at room temperature. Nothing about it is awkward.
It carries no flavour of its own
Products with their own taste profile do not have to work around it. That opens formats a distillate closes.
It removes the compliance question
With no THC to speak of, the threshold calculation stops being a concern. For a manufacturer that is worth a great deal.
What it gives up in exchange
The whole accompanying profile. That is the trade, and the packaging rarely spells it out.
What full spectrum means against these two
Where it sits
Further up the chain than either. It has undergone extraction but not the purification steps.
Why neither of these qualifies
Both have been purified, and both lost components doing it. A distillate is closer, but it is not the same thing.
Why the term appears anyway
Because it is not protected either. There is no defined share of accompanying compounds at which it stops applying.
How to check it
The cannabinoid profile on the report, and a terpene panel if one exists. Two lines beat the word on the label.
What we check and what we do not
We check what can be checked from documents: official registers, declared contents, certificates of analysis, divisions. We do not test products, do not produce rankings and do not claim any effect.
On this subject one check is exceptionally simple: the number of cannabinoid lines on the report. One means isolate, several mean distillate, and several with THC near the detection limit mean broad spectrum.
That is precisely why this page sets out what the nine percentage points contain. They are the whole difference, and the certificate shows them more clearly than any commercial description.