Casein
Proteins & Amino AcidsCAS: 9000-71-9
This is what the ingredient is.
Casein is the primary protein in milk, making up ~80% of milk protein.
Here is why it shows up on the label.
It works as a protein source and emulsifier. Used in cheese, protein supplements, and food coatings.
Here is what food agencies say.
The FDA lists Casein as Generally Recognized as Safe. Subject to milk allergen labeling.
Here is what research has found.
Complete protein. Slow-digesting compared to whey. Forms curds in stomach providing sustained amino acid release.
Here are a few things worth knowing.
CONTAINS MILK - major allergen. Different from lactose intolerance (casein is protein, not sugar).
Sources
- FDA GRAS
- USDA
- Sports Nutrition Research
How to read this page
We publish plain facts about this ingredient so a label is easier to read. This is not medical advice, and it is not a recommendation to buy, avoid, or use anything. For a personal health question, talk with a clinician who knows your history.
v1.0Updated 9/12/2026