Olive oil labels are engineered to look trustworthy. Here's what actually tells you something — and what's decoration.
1. Harvest date (not best-by)
The single most useful line on any bottle. A best-by date can sit 18–24 months after bottling; a harvest date tells you when the olives were actually pressed. Polyphenols and freshness decay from that day. Olivea bottles state the harvest plainly — currently 2025/26 — on both the High Phenolic and Ultra lines.
2. A polyphenol number
"Rich in antioxidants" is a slogan; "1,000+ mg/kg, verified by qNMR at the University of Athens" is a measurement. If health is why you're paying EVOO prices, demand the number — the difference between 100 and 1,000 mg/kg is the whole story (see our comparison).
3. Single origin, named variety
"Packed in Italy" ≠ grown in Italy — much supermarket oil is a multi-country blend. A specific region and cultivar (Olivea: 100% Olympia variety, Kalamata, Messinia, Greece) means traceability and accountability.
4. Certifications that cost something
USDA Organic requires audited practices. Generic badges like "premium" and "cold pressed" (all modern EVOO is) cost nothing.
5. Dark glass or tin
Clear bottles look pretty on shelves and murder polyphenols with light exposure. Serious oil ships dark.
Red flags
- No harvest date anywhere
- Health language with no numbers
- "Blend of EU and non-EU oils"
- Bargain prices — genuine early-harvest oil can't be cheap; the yield is too low
Full science breakdown on our High Phenolic Olive Oil Guide page.
