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UPI. MADISON, Wis., May 11â Commercial mayonnaise may have been unfairly labeled as a source of food spoilage during the warm months, according to a study by the Food Research Institute of the University of Wisconsin. The study found that mayonnaise in salads actually helped reduce spoilage.
Best Answer: Commercially produced mayonnaise is a lot tougher than most of us think. From the standpoint of safety, you don't even have to refrigerate an opened jar of mayonnaise because it contains enough vinegar and/or lemon juice to provide an environment hostile to the development of harmful bacteria.