Most of us don’t think twice before spreading mayo on a sandwich or mixing it into a salad — but few realize how quickly it can turn risky once opened. Despite its creamy texture and long shelf life when sealed, mayonnaise expiration is no joke. Once air hits the jar, the clock starts ticking toward potential spoilage and bacterial growth. Because mayo is often used in foods that sit out — like potato salad or deviled eggs — even a slightly old batch can become a health hazard. Knowing when to toss it could save you from an unpleasant (and potentially dangerous) stomach issue.
