Not every bottle labeled 'extra virgin' delivers the benefits associated with real EVOO. Here's what actually matters when you're standing in the grocery aisle.
Check the harvest date, not just 'best by'
Olive oil degrades over time. A harvest date within the last 12-18 months is a good sign; a 'best by' date alone tells you little since it can be set years out.
Look for a dark bottle
Light degrades olive oil's polyphenols and flavor. Dark glass or tins protect quality better than clear glass.
Check for a specific origin
Labels that name a specific region or estate (rather than just 'Product of Italy/Spain/Greece' with no further detail) tend to indicate more traceable, higher-quality sourcing.
Trust your senses over marketing
Good extra virgin olive oil should taste slightly bitter and peppery, especially at the back of the throat ... that's the polyphenols. A flat, greasy, or rancid taste is a sign of poor quality or age, regardless of the label.
Certifications help, but aren't everything
Seals like PDO (Protected Designation of Origin) or third-party quality certifications add a layer of verification, but plenty of excellent oils from small producers won't carry them.
Buy a size you'll use in 2-3 months
Oil oxidizes once opened. A giant tin that sits half-used for a year loses much of its benefit ... buy a size that matches your actual usage.