The former should have clean, unbroken shells and should not rattle when shaken. Shelled peanuts, often available in vacuum-sealed jars or cans, are usually roasted and sometimes salted. Refrigerate unshelled peanuts tightly wrapped for up to 6 months. Vacuum-packed shelled peanuts can be stored unopened at room temperature for up to a year. Once opened, shelled peanuts should be refrigerated airtight and used within 3 months.
Peanuts are high in fat and rich in protein.