Do I Need to Refrigerate Ketchup? An A-to-Z Guide to Storing Condiments
Briefly

The article discusses the optimal storage of condiments and ingredients like soy sauce, peanut butter, and mustard. While some people refrigerate these items, experts clarify that the recommendations to refrigerate are mainly to maintain flavor quality and freshness, rather than due to health risks. Preservatives in these products inhibit spoilage, allowing most to be safely stored at room temperature if they are used frequently. Storage should be well-sealed and kept cool and dark to prevent oxidation, with specific guidance for items bought from refrigerated sections.
The urging to refrigerate condiments after opening is often about maintaining quality rather than addressing serious health risks, as many condiments contain preservatives that inhibit spoilage.
If purchased from the refrigerated section, it's best to continue storing them in the fridge. Otherwise, consider usage frequency to determine the best storage option.
Read at cooking.nytimes.com
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