Casein is the predominant protein in milk. For example, the protein in cheese and cottage cheese is casein. Sometimes it's shown on the label as caseinate or micellar casein. Milk (casein) is a slow digesting protein that keeps you full longer. Casein also has a naturally high glutamine content, higher than whey, egg or soy. It is one of the best proteins for building muscle. And casein is very low in lactose.
Protein powders with casein are excellent for meal replacements or when you want a shake to really fill you up. A milk protein-based shake is commonly used right before bed to keep your muscles fueled with protein throughout the night.