All we are saying is give Darwin a chance

“Okay, I see “cream” is an ingredient, but what about milk? I’m allergic to milk.”

Here’s how Food & Wine puts it:

If you've purchased any butter from Costco lately then it's time to check your fridge. 

In early October, the FDA sent out an initial recall on Kirkland Signature butter, produced by Continental Dairy Facilities Southwest LLC. The recall is for 79,200 pounds of butter due to an undeclared allergen. According to the FDA, the packages of both salted and unsalted Kirkland Signature Sweet Cream Butter list cream as an ingredient, but may not contain the "Contains Milk" allergy statement visible on the packaging.

That’s right, butter turns out to be made from milk. Who knew?

Of course, there is precedent: