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You are watching: Does mayonnaise need to be refrigerated


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Mayonnaise is a not-so-secretly risky condiment. Every summer there are warnings about eating that potato salad at the family members picnic or lobster roll at the coast that's to be sitting out in the sunlight for hours, for are afraid of gaining sick. You might be emotion brave and take a bite anyway, which begs the question. Exactly how long have the right to be mei be left the end of the fridge, really? and also what's the shelf life the mayonnaise anyway? Well, the really counts on what sort of mayonnaise you've got on hand, but chances are good it's much shorter than friend think.


To be clear, we're not talking about imitation mei or vegan mayo here. We're talking about the shelf life of genuine mayonnaise, as characterized by the US federal government (because of course there's a regulation in the joined States around what's actually thought about to be mayo and also what's not). Follow to the us Food and also Drug Administration, in the unified States, actual mayonnaise requirements to be no much less than 65 percent vegetables oil, through vinegar, lemon juice, and some form of egg yolk.


It's the consist of of one egg yolk that renders mayo perishable and also notoriously tricky to handle. "Traditionally, mayonnaise is made v raw egg yolks, and also therefore carries a slight hazard of salmonella infection," defines food scientist Harold McGee in his publication On Food and Cooking: The Science and also Lore that the Kitchen, adding, "Manufacturers usage pasteurized yolks, and also cooks concerned around salmonella have the right to now discover pasteurized egg in supermarkets." This raw egg is component of the factor McGee recommends treating mayo, "as a highly perishable food that have to be served instantly or preserved refrigerated."


Most advertisement mayonnaises, prefer Hellman's real Mayonnaise or teacher Kensignton's Mayonnaise, room shelf-stable before opening. That's why the bottle or jar deserve to sit unrefrigerated in the supermarket. However once you open it up, you've obtained to store mayo in the fridge, and also Sir Kensington's notes that refrigerated mayonnaise will "be for sure to enjoy around 2 month after you very first open your jar or bottle." therefore if you've had an open up jar of mayo in your fridge for the far better part the the year, it's probably time to throw the stuff away.


The perishable nature the mayonnaise is likewise why you should throw out mei that's to be left out unrefrigerated overnight. It can be totally fine—until you get food poisoning. And, in general, the FDA recommends tossing perishable foods, including mayo, that have actually been left out at room temperature for 2 or much more hours.

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So placed that mei in the fridge and replace the after 2 months, or just make your own mayo and also use the ASAP. Just be smart, and please don't gain salmonella from your potato salad.