Whey and modified whey — byproducts of cheese manufacturing — are high-value dairy ingredients used in sports nutrition, infant formula, animal feed, and food processing, whether supplied in liquid, concentrated, or dried form. Modified whey, including whey protein concentrates (WPC) and whey protein isolates (WPI), commands premium pricing and is subject to the same US dairy TRQ framework as other dairy imports. USDA FSIS admissibility requirements apply, and the degree of protein concentration or modification should be clearly documented, as it affects both classification and end-use labeling. The heading covers both sweetened and unsweetened forms, so added-sugar declarations must be accurate.

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