"Casein Protein: the Sustained-release Muscle Fuel. Derived From Milk, Casein Protein Digests Slowly, Providing a Steady Stream of Amino Acids Over an Extended Period. Perfect for Nighttime Use or Between Meals, Casein Promotes Muscle Repair and Growth While Helping to Curb Hunger and Support Satiety. Experience Long-lasting Nourishment and Muscle Support With This Versatile Protein Option, Ideal for Those Seeking Sustained Protein Absorption Throughout the Day."