Best Olive Oil UK (2026): High-Polyphenol Picks and How to Read Labels

Why extra virgin olive oil?

Extra virgin olive oil (EVOO) is pressed from olives without heat or chemical refining, so it keeps natural plant compounds called polyphenols, such as hydroxytyrosol, oleuropein and oleocanthal (the compound that gives a peppery catch in the throat). Refined 'light' or plain olive oils lose most of them.

What the evidence says

PREDIMED

The PREDIMED trial randomly assigned 7,447 Spanish adults at high heart risk to a Mediterranean diet with extra EVOO (about a litre a week per household), a Mediterranean diet with nuts, or a low-fat control diet. Major cardiovascular events were about 30% lower in the EVOO group (hazard ratio 0.69). The trial was republished in 2018 after problems with randomisation at some sites; results held when those participants were removed. It tested a whole diet, not oil alone.

Long-term cohort data

A Harvard analysis of over 90,000 US adults followed for 28 years found that people consuming more than half a tablespoon a day had a 19% lower risk of death than those who rarely used it. Replacing butter, margarine or mayonnaise with olive oil was linked to lower risk. This is observational, so it shows association, not proof.

Does polyphenol content matter?

The EUROLIVE trial gave 200 healthy men 25ml a day of olive oils with low (2.7 mg/kg), medium (164 mg/kg) or high (366 mg/kg) polyphenols. HDL ('good') cholesterol rose and oxidative damage markers fell more as polyphenol content rose. Based on this kind of evidence, EFSA backed a health claim, now in Regulation 432/2012: olive oil polyphenols contribute to the protection of blood lipids from oxidative stress, but only for oils with at least 5mg of hydroxytyrosol and its derivatives per 20g, roughly 250 mg/kg, eaten at 20g (about 1.5 tablespoons) a day.

Our picks at a glance

How we chose

We favoured oils that publish a polyphenol figure or minimum, a harvest date, origin and variety, sold in dark glass or tins. We included cheaper everyday EVOOs because the biggest evidence comes from using extra virgin olive oil instead of other fats, not from chasing the highest number. Prices were checked at brand sites, Healf, Kew and Morrisons.

How to read an olive oil label

1. Extra virgin: the only grade that keeps meaningful polyphenols.
2. Harvest date: fresher is better; polyphenols fall over 12 to 18 months and faster once opened.
3. Polyphenol figure: look for mg/kg and the test date. 250 mg/kg or more meets the EU claim level.
4. Variety: Koroneiki, Coratina and Picual tend to be higher; Arbequina is milder and lower.
5. Packaging: dark glass or tins protect from light. Avoid clear bottles under shop lights.
6. Taste: bitterness and a peppery throat catch are signs of polyphenols.

Our picks in detail

Citizens of Soil Greek EVOO: best overall

Koroneiki oil from Sparta with a stated 434 mg/kg polyphenols (tested February 2026) and a December 2025 harvest date. In the range used in the best trials, at a fair price, with refill pouches. Caveat: the figure is published by the brand and will fall with age.

Odysea x Kew High Polyphenol EVOO: best value high-polyphenol

Greek oil with a stated minimum of 250 mg/kg, in line with the EU claim threshold, and your purchase supports Kew. Caveat: a minimum, not a batch figure, and no harvest date on the listing.

Olivea Ultra High Phenolic EVOO: best lab-verified premium

Sold as 1,000+ mg/kg, with harvest lab results published online. Caveat: no trial shows benefit beyond about 400 mg/kg, and it is very bitter. Lab reports are commissioned by the brand.

Honest Toil Cold Pressed EVOO: best unfiltered

Unblended Koroneiki from one Greek village, pressed the day it is picked, with low acidity. Caveat: no polyphenol figure, and unfiltered oil should be used within months.

Belazu Verdemanda and Early Harvest: best Spanish options

Early-picked Arbequina from a well-regarded UK importer; the litre Early Harvest is good value for cooking. Caveat: no polyphenol figures, and Arbequina is naturally milder.

Morrisons The Best Manzanilla EVOO: best budget

A single-variety extra virgin oil at a supermarket price, ideal for daily cooking. Caveat: no polyphenol figure or harvest date.

How much does a high-polyphenol oil really cost per day?

At the EU claim amount of 20g (about 1.5 tablespoons) a day, a 500ml bottle lasts around three and a half weeks. That works out at roughly 25p a day for Morrisons The Best, about 65p a day for Odysea x Kew or Honest Toil, about 75p a day for Citizens of Soil and around £1.45 a day for Olivea. For most people, the best plan is a good everyday extra virgin oil for cooking plus a higher-polyphenol bottle for drizzling over salads, vegetables and bread.

What to avoid

• Paying premium prices for 'high polyphenol' without a figure or test date.
• Drinking shots of oil as a supplement: it adds about 120 calories a tablespoon and has not been tested that way.
• Olive oil capsules or extracts marketed with the claim: the evidence is for oil used in food.
• Leaving bottles by the hob or in sunlight.

Bottom line

The proven move is swapping butter and other fats for extra virgin olive oil, around one and a half to two tablespoons a day. A fresh, well-labelled oil around 250 to 450 mg/kg, such as Citizens of Soil or Odysea x Kew, gives you the polyphenol level backed by research without paying for numbers no trial has tested.