Mayonnaise Mayonnaise is generally safe to eat, but it can become dangerous if it is not handled or stored properly. Mayonnaise is made with raw eggs, which can contain harmful bacteria such as Salmonella. If the eggs used to make the mayonnaise are not cooked or pasteurized, the finished product can also contain harmful bacteria. Additionally, mayonnaise that has been left out at room temperature or has been stored for an extended period of time can also become contaminated with bacteria. To reduce the risk of foodborne illness, it is important to handle and store mayonnaise safely: Keep mayonnaise refrigerated at all times, before and after opening. Do not use mayonnaise that has been left out at room temperature for an extended peri...
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