The two main types of milk protein that cause a milk allergy are casein and whey. When a person with a true milk allergy ...

If you are allergic to casein, a protein in milk, that can increase mucus production and congestion, he added. Casein is not only in other dairy products like yogurts and cheeses, but it can be ...

Some people need to avoid dairy products because their bodies can't digest lactose or they have an intolerance or allergy to proteins in cows' milk: casein, albumin or whey. If you’re allergic ...