Allergen - Casein

What is casein, and how does it trigger allergies?

Casein is a protein found in milk and dairy products, and an allergy to it occurs when the immune system mistakenly identifies it as harmful. Symptoms range from hives, swelling, digestive issues, and nasal congestion to severe anaphylaxis. Casein allergy is more common in infants but can persist into adulthood.


Is casein intolerance the same as lactose intolerance?

No, casein allergy is an immune reaction, while lactose intolerance is a digestive disorder caused by a deficiency in lactase, the enzyme that breaks down lactose. Individuals with a casein allergy must avoid all dairy products, whereas those with lactose intolerance may still tolerate lactose-free dairy.


What foods should be avoided with a casein allergy?

Casein is present in milk, cheese, yogurt, butter, ice cream, and processed foods containing milk derivatives such as caseinates. Always check ingredient labels for hidden sources of casein.