Milk protein isolate contains casein and whey protein. This combination provides a complete and high-quality amino acid profile, which results in good absorption by the body.
Whey protein is the best known protein when it comes to protein supplements and comes from milk. During the process of converting milk to cheese, whey protein is separated. Whey protein is absorbed quickly (about 2 hours) by the body.
Casein, like whey protein, is also derived from milk. This protein has long amino acid chains, therefore it takes longer (about 6 to 8 hours) before the body has fully absorbed the casein.