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Partially Hydrolyzed Whey Protein Isolate

Also known as: Partially hydrolyzed WPI, Hydrolyzed whey isolate

Low concern

Hydrolyzed whey is widely used and generally well-tolerated. As a milk-derived protein it is a major allergen and unsuitable for those with milk allergy; partial hydrolysis reduces but does not eliminate allergenicity.

What it is

Whey protein isolate that has been partially broken down by enzymes into shorter peptides for faster digestion and reduced allergenicity.

Protein source providing rapid amino acid delivery in sports nutrition, infant formulas, and medical nutrition products.

Why it's flagged

Milk allergen — not safe for milk-allergic individuals despite hydrolysis
Contains lactose traces depending on processing

Regulatory status

United States — FDA

GRAS as a milk-derived protein ingredient

European Union — EFSA

Authorised food ingredient; allergen labeling required

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