Casein protein powder is a slow-digesting protein, which means it can help to provide a steady stream of amino acids to the body over an extended period of time. This can be beneficial for those who are looking to maintain muscle mass and support muscle recovery during periods when they are unable to eat a meal, like overnight or between meals. Additionally, casein protein powder can also help to increase satiety, making it a good option for those who are looking to control their calorie intake.