What is the difference between lactose and casein?

Lactose is a sugar contained in milk and dairy products, whereas casein is a protein component of milk.

Note: The kiweno incompatibility test* tests, among other things, for the milk protein casein, but not for milk sugar (lactose). The kiweno lactose intolerance genetic test, in turn, determines whether you may suffer from primary lactose intolerance.

* The kiweno incompatibility test is available exclusively in Austria.