Optimum Nutrition 100% Gold Standard Casein, Creamy Vanilla, 4 LBOptimum Nutrition Gold Standard 100% Casein, Creamy Vanilla, 4 LB, is a highquality protein supplement designed for slow digestion and absorption. Comprising 80% of milk proteins, casein is ideal for prolonged muscle support. This product is particularly beneficial for muscle building, preventing muscle wasting, and enhancing strength during workouts. It is best consumed at bedtime, during long periods without food, or during fasting. Key features