Mayonnaise should be stored in the refrigerator, not in the cupboard. Refrigeration helps maintain the quality and safety of mayonnaise by slowing down the growth of bacteria, yeast, and mold that can spoil the product. The cool temperature of the refrigerator helps to extend the shelf life of mayonnaise and keeps it safe for consumption.
When mayonnaise is kept at room temperature or in a cupboard, it is more susceptible to bacterial growth, especially in warmer environments. As a general food safety guideline, perishable items like mayonnaise should not be left at room temperature for extended periods to prevent the risk of foodborne illnesses.
To ensure the best quality and safety of mayonnaise, always store it in the refrigerator, and make sure to check the expiration date on the packaging. Additionally, keep the lid tightly closed when not in use to prevent contamination and spoilage. If you notice any unusual odors, flavors, or changes in the texture of the mayonnaise, it's best to discard it and get a new container.