Not usually. Other ingredients are often responsible.
Myth 3: You can always tell if mayonnaise is bad
Not always. Some harmful bacteria don’t change smell or taste.
How Long Does Mayonnaise Last?
Unopened:
Can last months at room temperature
Check expiration date
Opened:
Best stored in the refrigerator
Typically safe for 1–2 months after opening (depending on brand and handling)
Homemade:
Refrigerate immediately
Use within a few days
Best Practices for Safe Use
To reduce risk and maintain quality:
Refrigerate after opening
Avoid leaving it out for extended periods
Use clean utensils to prevent contamination
Keep the lid tightly sealed
