No ___! (punnily named dairy-free chocolate brand) (4)

I believe the answer is:

whey

(Other definitions for whey that I've seen before include "Watery liquid left when milk forms curds" , "Milk serum" , "Product of clotting milk" , "Watery content of milk" , "Watery part of milk after curd separation" .)

I've seen this clue in The New York Times.

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