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Casein protein takes longer to digest and absorb, which means it feeds your muscles over an extended period of time unlike whey protein, which is your quick fuel on the go. Casein is often considered an anti-catabolic, as it prevents muscle breakdown through a steady and prolonged release of amino acids. When you supplement with casein protein powder, the level of amino acids in your blood and the protein synthesis in your body peak within three to four hours after intake.