Ask a Cook: Does a jar of garlic go bad?

Remember that the date on a jar often isn’t an expiration date. It may be a sell-by date, meant to help stores rotate the stock on their shelves, or a best-by date, which is about the quality of a product, not the safety. Sometimes it will say that in very tiny print next to the date.

Jarred garlic usually has preservatives, such as citric acid, that give it a long shelf life. That’s why fans of fresh garlic dislike the stuff in the jar: too many preservatives.