Final Answer:
An unopened parmesan shake-on product can last for months to a year, while opened ones should be used within a few weeks to maintain freshness, stored in a cool, dry place or refrigerated, following any provided guidelines on the packaging.
Step-by-step explanation:
The shelf life or duration of use for a parmesan shake-on product can vary depending on factors such as the specific product, storage conditions, and whether it is opened or unopened. Generally, parmesan shake-on products, which are typically grated or powdered parmesan cheese, often have a relatively long shelf life.
Unopened parmesan shake-on products, when stored in a cool, dry place, can last for several months to a year or more beyond the expiration date. Once opened, it's essential to reseal the packaging tightly and store it in the refrigerator to maintain freshness. In such cases, it is advisable to use the product within a few weeks to a couple of months for optimal quality.
Always check the product's packaging for specific guidelines on storage and usage, and pay attention to any expiration or "best by" dates to ensure the freshness and safety of the parmesan shake-on.