What is the shelf life of most opened mayonnaise when stored in a fridge?

The shelf life of most opened mayonnaise when stored in the refrigerator is generally around 2 months. This duration is primarily attributed to the ingredients used in mayonnaise, which typically include eggs, oil, and vinegar. Once opened, the exposure to air and potential for microbial growth necessitates a shorter shelf life compared to unopened mayonnaise.

Although some mayonnaise brands may include preservatives that can extend the product's life, the common guideline advises using opened mayonnaise within 2 months to maintain the best quality and safety. It's also important to ensure that the mayonnaise is kept refrigerated consistently and stored in a clean, airtight container after opening, as these practices help to prevent contamination and spoilage.

Choosing a longer shelf life, such as 3 or 6 months, might not reflect the best food safety practices, as mayonnaise can begin to lose its flavor and texture, and the risk of foodborne illness increases over time. Therefore, adhering to the guideline of 2 months is essential for ensuring safe consumption.