It's essential to follow the storage instructions provided by the manufacturer on the packaging of any food product, including jelly. If the jelly's label indicates that it should be refrigerated after opening, it is crucial to refrigerate it promptly to ensure food safety.
When a product requires refrigeration after opening, it generally means that the contents have a higher risk of spoilage or bacterial growth once exposed to air. Refrigeration slows down the growth of bacteria and helps maintain the quality and safety of the jelly.
If you have left the jelly unrefrigerated for an extended period contrary to the instructions, it is best to discard it to avoid the risk of foodborne illness. Microorganisms can multiply rapidly in perishable foods like jelly left at room temperature, potentially causing food poisoning.
It's important to note that the exact time a jelly can stay safe without refrigeration can vary depending on factors such as the specific ingredients, preservatives used, and the conditions it was exposed to. To be safe, always follow the manufacturer's instructions and use the "best by" or "use by" date as a reference for the product's shelf life before opening. Once opened, refrigerate it promptly and consume it within the recommended timeframe to ensure its safety and quality. When in doubt, it's best to err on the side of caution and dispose of jelly or any food product if you are uncertain about its safety.