As a hard, aged cheese, Gruyère is quite stable and can be stored for a month or more. Avoid Gruyère that has mold on the surface, or that has butterfat pooling inside the plastic wrapper.
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The information presented in the Food Guide is for informational purposes only and was created by a team of US–registered dietitians and food experts. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements, making dietary changes, or before making any changes in prescribed medications. Information expires June 2014.