Mayonnaise is a ubiquitous refrigerator staple that often outlasts our memory of when it was opened. You might use it for a quick sandwich or a batch of potato salad, return it to the fridge, and forget about it for weeks. Eventually, you will spot the jar and wonder if it is still safe to consume. The answer depends on several critical factors, including whether the mayonnaise is homemade or commercially produced, how long it has been open, how consistently it has been refrigerated, and whether it shows any physical signs of spoilage.
Commercially prepared mayonnaise is highly stable. An unopened jar will generally retain its quality until the date printed on the package, provided it has been stored according to the manufacturer's instructions. Once opened, however, the clock starts ticking. A widely accepted guideline is to use opened commercial mayonnaise within approximately two months, assuming it has been kept continuously refrigerated. This timeline can vary based on the specific brand, its ingredients, and how carefully it is handled. Repeated exposure to warm temperatures or the use of unclean utensils can significantly accelerate spoilage.
Homemade mayonnaise requires a much more cautious approach. Because it often contains raw eggs and lacks the industrial processing and preservatives of commercial brands, it is a highly perishable item. If you make mayonnaise at home, you should follow the specific storage instructions of your recipe and consume it promptly. Using pasteurized eggs is a highly recommended safety measure for uncooked preparations.
Understanding the best-by date is also important. This label primarily indicates peak quality rather than an absolute cutoff for safety. However, it should not be ignored. When deciding whether to use an older jar, you must evaluate the complete context. Consider how long it has been open, whether it has remained consistently cold, if the container is compromised, and whether it has been exposed to cross-contamination.
You can often identify spoiled mayonnaise...
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