Refined Olive Oil: What It Is, How It's Made, and Why You Can't Buy It
Refined olive oil is one of the most misunderstood terms in the category, partly because almost nobody has knowingly bought a bottle of it. It is a genuine legal grade with a legal definition, and it is in a great many kitchens — but not under that name. Refining is an industrial process, not a marketing word: a sequence of chemical and thermal steps that takes an oil which failed the taste and acidity tests and turns it into something odourless, colourless and stable. This article explains what those steps actually do, what they take out, what survives, and why the bottle on the shelf says something else entirely.
For our own oil, see our cold-pressed organic Marrakech olive oil.
The Short Answer
- Refined olive oil is olive oil that has been chemically and thermally treated to strip out the faults — high acidity, off-flavours, colour and smell — that stopped it qualifying as virgin or extra virgin.
- The starting material is usually lampante oil: virgin oil from the mill that failed the sensory panel or came in above the acidity limit, and which cannot be sold to consumers as it is.
- Refining is typically four stages — degumming, neutralising, bleaching and deodorising — and the last of those uses steam under vacuum at temperatures in the region of 200°C and above.
- Under Annex VII of Regulation (EU) No 1308/2013, refined olive oil is defined as olive oil obtained by refining virgin olive oil, with free acidity of not more than 0.3 grams per 100 grams.
- You cannot buy it on its own. Article 6 of Commission Delegated Regulation (EU) 2022/2104 permits only four legal names at retail, and "refined olive oil" is not one of them; the refined oil reaches you blended with virgin oil under the name "olive oil composed of refined olive oils and virgin olive oils".
- That blend is legally barred from carrying a designation of origin on the label, cannot state a harvesting year, and cannot describe its own taste or smell — three signals a good oil uses to prove itself.
- Refined blends are not dangerous or fraudulent. They are a high-heat cooking fat with the flavour and the polyphenols engineered out, and they should be bought and priced as exactly that.
What Refined Olive Oil Actually Is
Every olive harvest produces some oil that is not good enough to sell as it is. Fruit that sat too long before pressing, olives that fell and bruised, a batch that fermented in the bin overnight — the resulting oil comes out of the mill with high free acidity, a musty or winey taste, or both. In the EU grading system that oil is called lampante virgin olive oil, and it is explicitly not intended for the retail market. Historically it was burned in lamps, which is where the name comes from.
Refining is what happens to it instead. The process does not add anything to the oil that stays in it; it removes things. What comes out the other end is chemically still olive oil — the fatty acid profile is essentially unchanged, so it is still predominantly oleic acid — but it is close to odourless, close to colourless, and stripped of the compounds that gave the original oil its character.
That is worth stating plainly, because both of the usual reactions to refining are wrong. It is not poison, and it is not a swindle. It is an industrial correction process applied to a raw material that would otherwise be waste, and it produces a functional cooking fat. What it does not produce is anything you would want to pour over a tomato.
How Olive Oil Is Refined, Step by Step
Olive oil refining follows the same broad sequence used across the edible oils industry. Each stage targets a different defect, and each takes something out.
| Stage | What happens | What it removes |
|---|---|---|
| Degumming | Water or acid is mixed in to hydrate and separate phospholipids | Gums, phospholipids, some trace metals |
| Neutralising | An alkali — typically caustic soda — reacts with the free fatty acids to form soaps, which are separated off | Free fatty acids, which is how acidity falls to 0.3% or below |
| Bleaching | The oil is mixed with an absorbent clay or earth, then filtered | Chlorophyll, carotenoids, oxidation products — this is where the green and gold go |
| Deodorising | Steam is passed through the oil under vacuum at high temperature | Volatile aroma compounds — the peppery, grassy, fruity notes, and the musty ones |
Deodorisation is the stage that matters most for what you end up with. It runs hot — industrial deodorisation of edible oils works in the region of 200°C and above — and heat of that order is not survivable by the compounds that make a good oil interesting. Olive oil polyphenols such as oleocanthal and oleuropein degrade with heat and time; the aroma volatiles are, by design, boiled off. Some fat-soluble minor components, including squalene and part of the tocopherol content, survive in reduced amounts.
The result is exactly what the process was designed to produce: a neutral oil with a low free acidity, a long shelf life and a higher smoke point than an unrefined oil, because the free fatty acids and fine particles that make extra virgin start smoking earlier have been taken out.
Why You Will Never See a Bottle Labelled "Refined Olive Oil"
This is the part almost every article on the subject misses. Under EU marketing standards — Commission Delegated Regulation (EU) 2022/2104, which the UK broadly mirrors in retained law — only four legal names may appear on olive oil sold to consumers, and "refined olive oil" is not among them.
| Legal name on the label | What the regulation says it is | May state origin? | May state harvest year? |
|---|---|---|---|
| Extra virgin olive oil | Superior category olive oil obtained directly from olives and solely by mechanical means | Must | Yes |
| Virgin olive oil | Olive oil obtained directly from olives and solely by mechanical means | Must | Yes |
| Olive oil composed of refined olive oils and virgin olive oils | Oil comprising exclusively olive oils that have undergone refining and oils obtained directly from olives | Must not | No |
| Olive-pomace oil | Oil comprising exclusively oils obtained by treating the residue left after extraction, blended with oils obtained directly from olives | Must not | No |
So the refined oil does reach you — it simply arrives blended with a proportion of virgin oil to give it back some colour and taste, and it is sold under that third name, usually shortened on the front of the bottle to plain "olive oil", or dressed up as "classic", "mild", "light" or "pure". Our piece on classic olive oil goes through those front-label terms one by one.
The restrictions on that category are more revealing than the name. A refined blend must not bear a designation of origin. It may not indicate a harvesting year, because only extra virgin and virgin olive oil may do so. It may not carry organoleptic descriptions of taste or smell, and it cannot use "first cold pressing" or "cold extraction", both of which are reserved for virgin oils produced below 27°C. Read the back label of a bottle that tells you nothing about where the oil came from, when it was pressed, or what it tastes like, and you are usually reading a refined blend — not because the producer is hiding anything, but because the law does not let it say.
Is Refined Olive Oil Worse? An Honest Answer
The reasonable objection to everything above is that this sounds like a specialist producer talking down a mass-market product. So let us be precise about where refined blends genuinely lose and where they genuinely do not.
Where they do not lose much: the fat itself. Refining does not alter the glyceride structure, so a refined blend still has broadly the monounsaturated fatty acid profile that makes olive oil what it is nutritionally. If your reason for using olive oil is that you would rather cook in it than in something else, a refined blend delivers that.
Where they lose a great deal: everything that is not the fat. Polyphenols, chlorophyll and the aroma volatiles are the point of a good extra virgin olive oil, and bleaching and deodorising exist precisely to remove them. The EU's registered health claim for olive oil polyphenols protecting blood lipids from oxidative stress requires at least 5 mg of hydroxytyrosol and its derivatives per 20 g of oil — a threshold a refined oil has no realistic prospect of meeting, because the refining process is designed to strip those compounds out.
The second objection is the smoke point argument: that refined oil is simply better for cooking. It does have a higher smoke point, and for deep-frying at length that is a fair reason to choose it. But smoke point is a weaker guide to cooking performance than it is usually made out to be, and a good extra virgin is more heat-stable in ordinary pan cooking than its reputation suggests — a point we cover in our guide to the different types of olive oil.
The honest summary is that a refined blend is not a worse olive oil so much as a different product with the same botanical origin — and it should be judged, and paid for, on that basis.
When a Refined Blend Is the Sensible Choice
There is a real case for keeping one in the cupboard. Deep-frying a large quantity, roasting at high heat for a long time, greasing tins, or any dish where a peppery bitter note would be a distraction — all of these are jobs where the flavour of a good extra virgin would be wasted, burnt off, or actively unhelpful.
What a refined blend should never be is the only olive oil in the house. Nothing it does justifies paying an extra virgin price, and nothing an extra virgin does can be recovered once the oil has been through a deodoriser. Two bottles, each doing the job it is good at, is the arrangement that actually makes sense. If you want the criteria for choosing the good one, our guide to choosing a quality olive oil sets them out in full.
Why Sidr & Stone
Everything in this article is an argument for knowing what is in the bottle, which is the same argument we make for our own oil. We do not refine anything, and the things a refined blend is forbidden from telling you are precisely the things we lead with.
- Single-estate — one family-owned grove on the plains outside Marrakech, Morocco, with no blending across origins.
- Rain-fed — the trees are not irrigated; they take what the season gives them.
- Organically grown — no synthetic fertilisers, pesticides or herbicides.
- Single harvest — a small batch pressed once a season; when it is gone, it is gone until next year.
- Cold-pressed within hours of harvest — no heat, no alkali, no bleaching earth, no deodoriser.
- Unfiltered extra virgin — minimally processed, and it may show natural sediment, which is normal for an unfiltered oil.
- 100% natural — one ingredient, olive oil, with nothing added.
- Dark glass with a gold label — packaging that protects the oil from light.
- Halal certified.
- 10% of profits to charity — a commitment that applies across every Sidr & Stone product.
- Fulfilment in the UK, EU, and US.
We will not tell you Sidr & Stone is the best olive oil — that is the sort of claim this article exists to unpick. What we will say is that our oil is single-estate Moroccan, rain-fed, organically grown and cold-pressed within hours of harvest, and that we can print the grove, the season and the taste on the label because the grade allows it. You can read more in our piece on single-estate olive oil.
Frequently Asked Questions
What is refined olive oil?
Refined olive oil is olive oil produced by treating a lower-grade virgin oil — usually lampante — to remove its acidity, colour, smell and taste. Regulation (EU) No 1308/2013 defines it as oil obtained by refining virgin olive oil with free acidity of not more than 0.3 grams per 100 grams.
Is refined olive oil still healthy?
Refining leaves the fatty acid profile broadly intact, so a refined blend is still predominantly monounsaturated fat. What it loses is the polyphenol and aroma content, which is where much of the published research interest in olive oil sits. It is a food, and a reasonable cooking fat, rather than a source of those compounds.
Which olive oil is better, refined or unrefined?
For flavour, aroma and polyphenol content, unrefined extra virgin is better by a wide margin. For prolonged high-heat frying, a refined blend is more practical and cheaper to use in quantity. They are best thought of as two tools rather than a ranking.
What is the difference between refined olive oil and regular olive oil?
The bottle sold as plain "olive oil" is the refined one — legally, "olive oil composed of refined olive oils and virgin olive oils". Refined olive oil on its own is a trade category that is not permitted as a retail name, so the two are effectively the same product at different points in the supply chain.
Can you cook with refined olive oil?
Yes, and it is what refined blends are for. The higher smoke point and neutral taste suit deep-frying, long high-heat roasting and baking. Keep an extra virgin for anything where the oil is meant to be tasted.
Is refined olive oil the same as pomace oil?
No. Refined olive oil comes from virgin oil that was pressed from whole olives and then corrected. Olive-pomace oil is extracted from the residue left after pressing, then refined and blended. Both are separate legal categories, and we cover the second in our guide to pomace olive oil for cooking.
Does refining olive oil use chemicals?
Yes. Neutralising uses an alkali, usually caustic soda, to strip out free fatty acids, and bleaching uses an absorbent clay. Neither remains in the finished oil, and the process is standard across the edible oils industry — but it is a chemical and thermal process, not a mechanical one.
Is olive oil a medicine?
No. Olive oil is a food, not a medicine. It has a long traditional history — including being honoured in the Prophetic Sunnah — and a substantial body of modern research, particularly around polyphenols, cardiovascular health, and the Mediterranean diet pattern. It can be a worthwhile part of a healthy routine, but it does not cure diseases and is not a substitute for medical care. Be cautious of any olive oil marketed with specific disease-cure claims.
Final Thoughts
Refined olive oil is not a scandal and it is not a secret. It is an industrial correction applied to oil that did not make the grade, and the finished blend does a job that a good extra virgin does badly. The problem is not the product; it is that the front label rarely makes the distinction, and the back label legally cannot say much at all.
The practical takeaway is small and useful. If a bottle tells you nothing about origin, nothing about harvest, and nothing about how it tastes, that silence is the answer to your question — and it should be reflected in what you expect from the oil and what you are willing to pay for it. If a bottle does tell you those things, it is because the grade permits it, which is itself a signal.
That is the whole case for buying an oil that can name its grove. Our cold-pressed organic Marrakech olive oil — single-estate, rain-fed, organically grown and pressed within hours of harvest — is open for pre-order now on its limited first harvest, with fulfilment in the UK, EU, and US.
Pre-Order Sidr & Stone Organic Marrakech Olive Oil — Limited First Harvest →
Disclaimer: This article describes olive oil refining practices and the marketing standards in force at the time of writing; regulations, category definitions and producer practices may change, and readers should check current sources before relying on any labelling detail. Olive oil is a food, not a medicine, and is not a substitute for medical treatment of any condition. For any health concern, consult a qualified medical professional.