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Refrigerate or Leave Out? The Truth About Mayonnaise Storage

Posted on April 18, 2026

Mayonnaise feels harmless—until it isn’t. One wrong storage habit, and that creamy favorite can turn into a silent threat sitting in your fridge door. Or worse, on your counter. Most people have no idea how fast bacteria can spread in it, or why homemade mayo is even more dangerous. The real risk begins the moment you lea… Continues…

Most commercial mayonnaise is safer than people think, but only when handled correctly. Because it’s made with pasteurized eggs and added acids, it’s designed to resist bacterial growth—yet that protection has limits. Once opened, every dip of a spoon or knife introduces new microbes. If the jar is then left out for more than two hours, especially in a warm kitchen, those microbes can multiply to dangerous levels. Storing it consistently below 40°F (4°C) is essential to slow this process.

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Homemade mayonnaise demands even more caution. Without preservatives and often made with raw or lightly cooked eggs, it’s far more vulnerable to contamination and should go straight into the refrigerator and be used within a few days. Always use clean utensils, close the lid tightly, avoid temperature swings, and when in doubt about smell, texture, or color, throw it away. Your sandwich isn’t worth a night of food poisoning.

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