Optimum Nutrition Gold Standard 100% Casein, 4 LB, Chocolate Peanut ButterOptimum Nutrition Gold Standard 100% Casein, Chocolate Peanut Butter, 4 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. This product helps build and preserve muscle, preventing muscle wasting over extended periods. It also