Refrigerate or Leave Out? The Truth About Mayonnaise Storage
Mayonnaise is one of those everyday foods that quietly sparks a surprisingly heated debate:
Should you refrigerate it—or is it safe to leave it out?
You’ll hear confident answers on both sides. Some say, “It’s full of preservatives, it’s fine.” Others insist, “Leave it out and you’ll get sick.”
The truth sits in the middle—and it depends on what kind of mayonnaise you have, how it’s handled, and how long it’s left out.
This guide breaks down the science behind mayonnaise, the real risks, and the safest way to store it without overthinking—or taking unnecessary chances.
What Is Mayonnaise Made Of?
Traditional mayonnaise is an emulsion made from:
Oil
Egg yolks
