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Is casein protein powder gluten free?

Casein protein powder is naturally gluten-free as it is derived from milk, which does not contain gluten. Gluten is a protein found in wheat, barley, and rye, and is not present in dairy products. Therefore, pure casein protein on its own does not include gluten1.

However, it is important for consumers with gluten sensitivities or celiac disease to be cautious, as some casein protein powders may be processed in facilities that also process gluten-containing ingredients, which can lead to cross-contamination. Additionally, some brands of casein protein powders might add ingredients that contain gluten or use flavorings and fillers that are not gluten-free2.

To ensure a casein protein powder is completely gluten-free, look for products that are certified gluten-free. This certification indicates that the product has been tested and meets strict standards for gluten content. Always check the ingredient list and manufacturing information on the packaging for any mention of gluten-containing substances or potential cross-contamination warnings3.


  1. Ciclitira, P. J., Ellis, H. J., & Lundin, K. E. (2005). Gluten-free diet – what is toxic? Best Practice & Research Clinical Gastroenterology, 19(3), 359-371.
  2. Thompson, T. (2005). Wheat starch, gliadin, and the gluten-free diet. Journal of the American Dietetic Association, 105(12), 1930-1931.
  3. Fasano, A., & Catassi, C. (2012). Celiac Disease. New England Journal of Medicine, 367(25), 2419-2426.
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