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The "slow" digestive protein in milk that is found primarily in milk and cheese. Casein is responsible for the white and opaque appearance of milk, as it is a combination of calcium and phosphorus. This is also why it can sometimes be difficult to completely dissolve in your choice of liquid base for your casein consumption if you choose to drink this protein powder. Casein is the majority of the protein in milk and also a complete protein source with a complete amino acid profile. Casein is absorbed over a longer period of time resulting in increased absorption and aids the body in protecting and preserving muscle tissue breakdown.