Recover overnight with Gold Standard 100% Casein Drink Mix. This protein powder drink mix is slow to digest and absorb, making it ideal for helping your body refuel while you sleep. Compared to some other proteins, Gold Standard 100% Casein generally takes longer to break down into its amino acid subcomponents. The formula uses only premium micellar casein as its protein source, setting the standard for slow-digesting protein support. Fuel up every night and support recovery with Gold Standard 100% Casein Drink Mix. The Chocolate Supreme flavor delivers premium taste along with high-quality micellar casein protein. Optimum Nutrition, part of the Glanbia global nutrition group, has been setting the Gold Standard in sports nutrition for more than 30 years and is one of the few sports nutrition companies that owns and operates its own production facilities.