Mayonnaise seems harmless, quietly sitting alongside sandwiches and leftovers. But small, careless habits—like leaving it on the counter or dipping spoons into it after touching other foods—can turn it into a hidden risk. While store-bought mayonnaise is generally safe due to pasteurized eggs and acidity, improper handling can invite contamination.
The real danger lies in temperature. Mayonnaise should be kept below 40°F (4°C) to prevent bacterial growth. Leaving it out for over two hours, especially in warm environments, can make it risky. Homemade mayo, lacking preservatives, is even more sensitive and should be refrigerated immediately and used quickly.
Good kitchen habits—using clean utensils, sealing jars tightly, and avoiding temperature swings—are key to keeping mayonnaise safe. A small moment of care can prevent health risks and ensure meals nourish instead of harm.