Casein is one of the main proteins found in milk. In fact, about 80 percent of the protein in cow’s milk is casein. For someone with a milk allergy, casein can be one of the proteins that triggers an immune reaction.
Unlike lactose intolerance, a milk allergy involves the immune system. When someone allergic to milk consumes casein, their body may react with hives, swelling, vomiting, coughing, wheezing, or in severe cases, anaphylaxis.
Casein is found in many obvious dairy products like milk, cheese, yogurt, and ice cream. But it can also show up in less obvious places, such as processed foods, baked goods, protein powders, and even some non dairy labeled products. Ingredients like casein, caseinates, and sodium caseinate can indicate the presence of milk protein. If you’re ever in doubt whether a product contains milk, it’s best to go to the source and call the 1-800 number on the package and speak to the manufacturer directly.
For families managing a milk allergy, learning to spot casein on ingredient labels is essential. Even small amounts may trigger a reaction.
If you suspect a milk protein allergy, proper evaluation by a board certified allergist is important.
