Hello, I'm a food safety specialist with over 15 years of experience in the food industry. I'm here to help you understand how long unopened mayonnaise is good for.

Unopened mayonnaise, when properly stored, can last for a surprisingly long time. However, it's important to understand that "good" doesn't necessarily mean "safe to eat". **The shelf life of mayonnaise is determined by factors like quality, taste, and safety.**

**Here's a breakdown of the factors that influence mayonnaise's shelf life:**

* Quality: The quality of the mayonnaise will deteriorate over time, even if it's still safe to eat. The flavor will become less vibrant, and the texture may become thicker or thinner.
* Taste: Mayonnaise can start to taste "off" after a certain time. This is due to oxidation and the breakdown of fats. The flavor change might be subtle at first, but it will become more noticeable over time.
* Safety: This is the most important factor. Mayonnaise can harbor bacteria, particularly Clostridium botulinum, which can produce a deadly toxin. This bacteria thrives in low-acid environments, making mayonnaise a potential breeding ground.

**Here's a general guideline for unopened mayonnaise shelf life:**

* Refrigerated: Most commercial brands of mayonnaise will have a "best by" date printed on the container. This date is a guideline for optimal quality and flavor, not necessarily a safety deadline. **You can typically expect unopened mayonnaise stored in the refrigerator to be safe for about 2-3 months past the "best by" date.** However, it's important to always check the mayonnaise for any signs of spoilage before consuming it.
* Unrefrigerated: **Unopened mayonnaise should never be stored at room temperature for extended periods.** This is because the warm temperature promotes bacterial growth, including Clostridium botulinum. It's essential to store mayonnaise in the refrigerator at all times.

Signs of Spoiled Mayonnaise:

* Off odor: Mayonnaise should have a mild, creamy smell. If it has an unpleasant, sour, or rancid odor, it's best to discard it.
* Color change: Mayonnaise should be a pale yellow or white color. If it turns brown, gray, or green, it has likely spoiled.
* Texture change: Mayonnaise should be smooth and creamy. If it becomes lumpy, separated, or watery, it has likely spoiled.
* Mold: If you see any mold on the mayonnaise, it's definitely spoiled.

In conclusion, while unopened mayonnaise can last for a significant amount of time in the refrigerator, it's important to always prioritize safety and quality. **Pay attention to the "best by" date, check for signs of spoilage, and err on the side of caution when it comes to consuming mayonnaise past its recommended shelf life.**

Always remember, food safety is crucial for your health. If you have any concerns about the safety of your mayonnaise, it's always best to err on the side of caution and throw it away.
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