Peanut butter may seem like it lasts forever, but it can spoil faster than you think. An unopened jar with preservatives can last up to two years, but once opened, the shelf life drops to two to three months- or as little as one month for natural varieties.
To check if your peanut butter has gone bad, start with smell, taste, and appearance. A bitter, metallic, or soapy odor is a clear sign of rancidity. If the taste is pungent or bitter, it’s time to toss it. Changes in color, dryness, or visible mold also indicate spoilage. However, natural oil separation is normal and doesn’t mean the peanut butter has expired.
Eating peanut butter that has gone bad can lead to an upset stomach, including nausea, vomiting, diarrhea, or abdominal pain. Spoiled peanut butter may also contain harmful molds or bacteria, potentially leading to food poisoning. If you experience severe or prolonged symptoms after consuming spoiled peanut butter, seek medical attention promptly.
How to Store Peanut Butter Correctly: Storage affects freshness. Heat speeds up oxidation, so keeping peanut butter cool is key. Natural peanut butter stored at room temperature (77°F or higher) can start to degrade in as little as four weeks. Refrigerating is best but does make it harder to spread. Store other types in a cool cupboard.
For the best quality, check the expiration date, store it properly, and trust your senses. When in doubt, it’s better to toss it than risk a rancid snack.
