Products of Natural Milk Constituents (NESOI)

Milk protein concentrates — a key functional ingredient in cheese manufacturing and nutritional products — are specifically enumerated at line 0404901000, distinguishing them from the broader residual dairy categories at 0404905000 and 0404907000. New Zealand leads US import supply for this heading, followed by Canada and Germany, reflecting the dominance of large-scale dairy processing industries in those markets. Classification here requires confirming that the product is composed of natural milk constituents and does not fall under a more specific heading such as 0404 10 (whey) or Chapter 21 (food preparations). USDA FSIS admissibility requirements apply to dairy products in this heading; consultation with a licensed customs broker is recommended given the residual nature of the category.