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You are watching: Does mayonnaise have to be refrigerated



Mayonnaise is a not-so-secretly risky condiment. Every summer there are warnings around eating the potato salad at the family picnic or lobster roll at the beach that's to be sitting the end in the sun for hours, for are afraid of getting sick. You could be emotion brave and also take a bite anyway, i m sorry begs the question. How long can be mei be left the end of the fridge, really? and what's the shelf life that mayonnaise anyway? Well, the really depends on what kind of mayonnaise you've obtained on hand, but chances are great it's much much shorter than friend think.

To it is in clear, we're no talking around imitation mei or vegan mei here. We're talking around the shelf life of actual mayonnaise, as defined by the US government (because of food there's a regulation in the united States around what's actually thought about to it is in mayo and what's not). According to the us Food and Drug Administration, in the unified States, real mayonnaise demands to it is in no less than 65 percent vegetable oil, with vinegar, lemon juice, and some kind of egg yolk.

It's the consist of of one egg yolk that renders mayo perishable and notoriously tricky come handle. "Traditionally, mayonnaise is made v raw egg yolks, and also therefore carries a slight threat of salmonella infection," explains food scientist Harold McGee in his publication On Food and Cooking: The Science and also Lore that the Kitchen, adding, "Manufacturers use pasteurized yolks, and also cooks concerned around salmonella can now find pasteurized eggs in supermarkets." This life egg is part of the reason McGee recommends treating mayo, "as a extremely perishable food that should be served immediately or retained refrigerated."

Most commercial mayonnaises, favor Hellman's actual Mayonnaise or teacher Kensignton's Mayonnaise, are shelf-stable before opening. That's why the bottle or jar can sit unrefrigerated in the supermarket. However once you open up it up, you've obtained to store mayo in the fridge, and Sir Kensington's notes that refrigerated mayonnaise will certainly "be for sure to enjoy about 2 month after you very first open her jar or bottle." so if you've had an open up jar of mei in your refrigerator for the far better part of the year, it's more than likely time come throw that stuff away.

The perishable nature the mayonnaise is additionally why you have to throw out mei that's to be left out unrefrigerated overnight. It could be entirely fine—until you gain food poisoning. And, in general, the FDA recommends tossing perishable foods, consisting of mayo, that have been left out at room temperature for 2 or an ext hours.

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