Harvest Date Hack: Is Your Olive Oil Actually Pure?
A BuzzFeed-style piece explains that the best way to verify olive oil quality is to check for a harvest date on the bottle. If no harvest date is listed, the oil may not be 100% olive oil and could be a blend from multiple harvests or regions; “best before” dates reflect bottling age rather than harvest, and while dark glass helps protect flavor, packaging can’t fix old or low-quality oil.