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You are watching: How long can mayonnaise be left out


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Mayonnaise is a not-so-secretly risky condiment. Every summer there space warnings about eating that potato salad in ~ the family picnic or lobster roll at the coast that's been sitting out in the sunlight for hours, for are afraid of gaining sick. You can be feeling brave and take a bite anyway, i beg your pardon begs the question. Just how long can be mei be left the end of the fridge, really? and what's the shelf life of mayonnaise anyway? Well, that really depends on what kind of mayonnaise you've acquired on hand, however chances are great it's much much shorter than friend think.


To be clear, we're no talking around imitation mei or vegan mei here. We're talking around the shelf life of genuine mayonnaise, as characterized by the US federal government (because of food there's a regulation in the joined States about what's actually thought about to be mayo and what's not). According to the united state Food and Drug Administration, in the unified States, genuine mayonnaise requirements to it is in no much less than 65 percent vegetables oil, v vinegar, lemon juice, and also some kind 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 with raw egg yolks, and therefore carries a slight threat of salmonella infection," describes food scientist Harold McGee in his book On Food and also Cooking: The Science and also Lore that the Kitchen, adding, "Manufacturers use pasteurized yolks, and also cooks concerned around salmonella can now discover pasteurized eggs in supermarkets." This life egg is component of the reason McGee recommends treating mayo, "as a extremely perishable food that need to be served immediately or kept refrigerated."


Most advertising mayonnaises, favor Hellman's genuine Mayonnaise or teacher Kensignton's Mayonnaise, are shelf-stable prior to opening. That's why the party or jar deserve to sit unrefrigerated in the supermarket. However once you open it up, you've acquired to keep mayo in the fridge, and also Sir Kensington's notes the refrigerated mayonnaise will "be for sure to enjoy roughly 2 month after you very first open your jar or bottle." for this reason if you've had an open jar of mei in your fridge for the better part the the year, it's most likely time to throw the stuff away.


The perishable nature the mayonnaise is also why you must throw out mayo that's been left out unrefrigerated overnight. It could be entirely fine—until you acquire food poisoning. And, in general, the FDA recommends tossing perishable foods, including mayo, that have been left the end at room temperature for two or more hours.

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So placed that mei in the fridge and replace it after two months, or just make your own mayo and use the ASAP. Simply be smart, and please don't acquire salmonella from your potato salad.