Here is why Costco recalled almost 80,000 pounds of butter

Costco recalled nearly 80,000 pounds of store-brand butter last month because the product's label was missing a key ingredient: milk. 

The wholesaler recalled 79,200 pounds of two varieties of butter — 46,800 pounds of its Kirkland Signature Unsalted Sweet Cream Butter, and 32,400 pounds of Kirkland Signature Salted Sweet Cream Butter because it omitted the allergen. 

The Food and Drug Administration Butter said both products list cream, "but may be missing the Contains Milk statement."

The FDA classified the action as a "Class II" recall, which describes situations in which exposure to the product "may cause temporary or medically reversible adverse health consequences."

The products were made by Continental Dairy Facilities Southwest. The affected butter products include: 

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The FDA did not immediately reply to a request from CBS MoneyWatch for product-specific information on what people who have the recalled butter in their possession should do.

General guidelines from the FDA advise consumers who have purchased any recalled food to dispose of the product or return it to the retailer for a full refund.