Optimum Nutrition Gold Standard 100% Casein, 2 LB, Cookies and CreamOptimum Nutrition Gold Standard 100% Casein, Cookies and Cream, 2 LB, is a highquality protein supplement designed for muscle building and recovery. Casein protein, which constitutes 80% of milk proteins, is known for its slow digestion and absorption, making it ideal for prolonged periods without food intake, such as bedtime or fasting periods. This slowrelease protein helps build muscle, prevent muscle wasting, and increase strength during exercise.