Choose a dark bottle: Many companies try to entice shoppers with the color of the oil, but proper storage should limit exposure to sunlight.
Read the label carefully: Check the ingredient list for preservatives, flavoring, or coloring agents. Avoid those.
Note the date: Extra virgin has a relatively short shelf life—about a year. A good bottle should give some indication of the year and month or season when it was pressed.
Look for designations: Labels like IGT, DOC and DOG offer extra assurance that you’re going home with a quality product.