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Does vinegar expire?

The acidic nature of vinegar makes it a self-preserving pantry staple, which means it generally never sours or expires.

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Apple cider vinegar is often used in cooking and baking, or to make marinades, dressings, and even beverages. To make it, chopped apples are covered with water and left to ferment to form ethanol. Natural bacteria convert the ethanol into acetic acid, which is the main component of vinegar ( 1 ). It’s not often that an entire bottle of apple cider vinegar is used in one sitting, which may leave you wondering whether it ever expires. This article reviews whether apple cider vinegar goes bad, plus storage tips to improve its quality and shelf life. Share on Pinterest Shelf life and proper storage tips The acidic nature of vinegar makes it a self-preserving pantry staple, which means it generally never sours or expires. The pH scale, which ranges from 0–14 indicates how acidic a substance is. A pH lower than 7 is acidic, and a pH greater than 7 is basic. Acetic acid, the main constituent of apple cider vinegar, has a highly acidic pH between 2 and 3 ( 2 ). Vinegar has natural antimicrobial properties, which likely contribute to its long shelf life. In fact, vinegar can prevent the growth of illness-causing germs like E. coli, Staphylococcus aureus, and Candida albicans ( 3 , 4 ). In one study, vinegar had the most antibacterial characteristics when compared with coffee, soda, tea, juice, and olive oil ( 5 ). The best way to store apple cider vinegar is in an airtight container in a cool, dark place away from sunlight, such as in a kitchen pantry or basement. Refrigerating apple cider vinegar is unnecessary and does not improve its shelf life (6). SUMMARY Apple cider vinegar is highly acidic and has antimicrobial properties that make it a self-preserving pantry staple. While it technically never expires, storing it in a cool, dark place helps preserve its quality. How apple cider vinegar changes over time As vinegar ages, it may undergo aesthetic changes, such as becoming hazy or separating. You may also notice cloudy sediments or fibers at the bottom of the bottle. This is largely due to exposure to oxygen, which happens every time you open the lid ( 7 ). Over time, oxygenation also causes the release of citric acid and sulfur dioxide, two preservatives in vinegar (6). This could affect how it tastes or contributes to a recipe, but these changes don’t significantly affect the nutritional value or shelf life of apple cider vinegar. Before using apple cider vinegar that you’ve had for a while, you can smell and even taste it to make sure it’ll still work well in your recipe. Keep in mind that even though apple cider vinegar products may have an expiration date on them, many manufacturers note that its safe to use well beyond this date. SUMMARY Apple cider vinegar may undergo subtle aesthetic changes over time when exposed to oxygen, but this doesn’t significantly change its nutritional quality or shelf life.

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How long before mold starts to affect you?

Some people have an immediate reaction when exposed to mold, while others may not experience symptoms for days, weeks, or months. One of the reasons for this disparity is each individual's health: Allergies: People with allergies often have a compromised immune system.

Most of us have learned of the dangers of mold. The microscopic fungi thrive in environments where moisture can remain unchecked for an extended period. While we understand an inherent risk to our health from mold exposure, most of us are not sure how long it takes to start taking its toll. Sometimes referred to as the “silent killer,” many people are surprised to discover mold has been growing in their homes for quite some time. How long has it been there? Often there is no way to tell. So, if you’ve found mold has been growing in your home, you may wonder just how much damage it has already done. It’s a legitimate question to a genuine problem, but the answer is difficult to determine. Several factors may come into play when determining how long it takes for mold to affect you, and since each case is different, you may have to do a little more digging before fully grasping the extent of the risks.

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