Before you buy olive oil, check ten things on the label: grade, harvest date, best-by date, origin, cultivar, container, size, lot code, any polyphenol claim and the marketing words. Each takes seconds to read. Together they show whether the oil is likely genuine, recent and protected from light. What they cannot show needs a lab report.
- The words "extra virgin olive oil". This is the only grade that must pass both chemical limits and a tasting panel with zero defects. "Pure", "light" and plain "olive oil" are blends based on refined oil, so treat them as a different product.
- A harvest date or harvest month. Look for a stated harvest, such as "Harvested November 2025" or "2025/26 harvest". A missing harvest date is the most common red flag, because it hides the oil's age.
- The best-by date, read correctly. A best-by date is set by the bottler and usually counts from bottling, not harvest. Use it as a second check, never as proof of freshness.
- A specific origin. A good label names a country and often a region, mill or producer. "Packed in Italy" or "Product of the Mediterranean" can describe oil blended from several countries.
- The olive cultivar. A named variety, such as Koroneiki, shows the producer knows what is in the bottle. It is not proof of origin or quality alone.
- Dark glass or a tin. Light speeds up oxidation, so the oil should be in dark glass, coated metal or another opaque container. Clear glass or plastic on a bright shelf is a red flag.
- A size you can finish. Once opened, olive oil is best used within one to two months. A half-empty bottle loses quality to air.
- A lot or batch code. The code links the bottle to a production run and its test results. Without one, there is nothing to trace if a claim needs checking.
- A polyphenol number with a source. If a label states polyphenols, it should give a figure in mg/kg and point to a lab report you can read. A number with no report, method or date is a claim, not evidence.
- Marketing words with no definition. "Premium", "gourmet" and "authentic" have no legal meaning. Be wary when they are the loudest thing on the bottle.
Why each group of checks matters
Grade and origin (items 1, 4 and 5) tell you what the oil is. Under the International Olive Council standard and EU rules, extra virgin oil must have free acidity of no more than 0.8% and no sensory defects (European Commission, 2022). The printed grade is not always accurate. When the UC Davis Olive Center tested imported oils sold as extra virgin in California, 69 percent of imported samples failed the sensory standard (UC Davis Olive Center, 2010). A specific origin and named cultivar make a label harder to fake.
Dates (items 2 and 3) tell you how old the oil is. Flavour fades and polyphenols decline from the day the oil is milled. Our guide to how long olive oil stays fresh covers the timeline.
Container and size (items 6 and 7) tell you how well the oil has been protected. Packaging blocks light. The right size limits how long an open bottle meets air.
Lot code, polyphenols and wording (items 8, 9 and 10) tell you how much you can verify. They separate evidence from adjectives.
What to do in the shop in 30 seconds
Work through the shelf in this order and put bottles back as soon as one fails.
- Skip anything in clear glass or plastic.
- Turn the bottle and find a harvest date. No harvest date, back on the shelf.
- Confirm "extra virgin" and a specific country of origin.
- Pick the most recent harvest that comes in a size you will finish within a couple of months.
If two bottles tie, choose the one with a published test result. For more detail, read how to read an olive oil label.
What no label can tell you
A label cannot show how the oil was stored or whether it still meets the grade today. Two things need a lab.
Freshness. A harvest date tells you when the oil was made, not how oxidised it is. Only a test reports values such as peroxide value.
Polyphenols. Bitterness and a peppery finish suggest phenolic compounds, but taste cannot give a number. The EU allows the health claim that olive oil polyphenols contribute to the protection of blood lipids from oxidative stress only for oil containing at least 5 mg of hydroxytyrosol and its derivatives per 20 g (European Commission, 2012). Only analysis, usually by HPLC, can confirm it. Our page on high-phenolic olive oil explains how to read those results.
The label narrows the shelf. A dated lab report closes the gap. See what makes olive oil real.
How Pomoni does it
Pomoni is built to pass this checklist. It is extra virgin oil from early-harvest Greek Koroneiki olives, milled within hours and cold-extracted. The harvest month is printed on every dark glass bottle, in 100, 250 and 500 mL sizes. Every batch is tested by HPLC and the certificate is published on our testing and certifications page. You can see the current batch on the Pomoni high-phenolic olive oil page.
Frequently asked questions
What is the most important thing to check on an olive oil label?
The harvest date. It is the best single guide to freshness. A best-by date alone does not show the oil's age.
Does "first cold pressed" mean the oil is better?
Not by itself. EU rules reserve "cold extraction" and "first cold pressing" for oil made below 27°C, which covers most good extra virgin oil. Check the harvest date instead.
Is a seal or award on the bottle enough?
No. Seals such as PDO confirm origin, and awards reflect one tasting. Neither shows how old the bottle is.
How can I check polyphenol levels before buying?
Look for a figure in mg/kg linked to a dated lab report for that batch. If the seller cannot show the report, treat the number as a marketing claim.
Sources
- European Commission. Commission Delegated Regulation (EU) 2022/2104 on marketing standards for olive oil. 2022. eur-lex.europa.eu
- International Olive Council. Trade standard applying to olive oils and olive pomace oils, COI/T.15/NC No 3. internationaloliveoil.org
- UC Davis Olive Center. Tests indicate that imported "extra virgin" olive oil often fails international and USDA standards. 2010. olivecenter.ucdavis.edu
- European Commission. Commission Regulation (EU) No 432/2012 establishing a list of permitted health claims. 2012. eur-lex.europa.eu
- EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific opinion on health claims related to polyphenols in olive. EFSA Journal 2011;9(4):2033. doi.org/10.2903/j.efsa.2011.2033
