Whey
Whey is a milk-derived protein and a recognized major food allergen under FALCPA, requiring mandatory disclosure on US food labels. For non-allergic consumers, it is a safe nutritive protein.
What it is
Liquid or dried protein-rich byproduct of cheese making, derived from milk.
Protein fortification, emulsification, texture, browning (Maillard reaction), and flavor in baked goods, beverages, and processed foods.
Why it's flagged
- Major food allergen under FALCPA — must be disclosed
- Contains lactose (problematic for lactose-intolerant individuals)
- Not suitable for vegan diets
What regulators actually say
"FALCPA identified eight foods as major food allergens: milk, eggs, fish, Crustacean shellfish, tree nuts, peanuts, wheat, and soybeans."
Regulatory status
United States — FDA
Permitted; milk-derived ingredients trigger FALCPA labeling under 21 USC 343(w)
European Union — EFSA
Authorized; milk listed in Annex II of Regulation (EU) No 1169/2011 as allergen requiring declaration
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