A more long-digesting form of protein powder, Casein protein is just as complete as a whey protein and just as useful for muscular growth and development. Casein, however, comes with a few more benefits in terms of versatility and use. Firstly, casein is known as a slow-release protein source and this is because your body takes a lot longer to digest it. This gives your body a steadier release of amino acids for a longer period of time. Secondly, due to its thicker consistency, it will satiate you for longer, allowing you to feel fuller and less hungry after the period of its ingestion.