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 each night. Take it before bed to support recovery while you sleep. Compared to some other proteins, Gold Standard 100% Casein takes longer to break down into its amino acid subcomponents. It is formulated to set the standard for slow-digesting protein support by using only premium micellar casein as the protein source. Fuel up every night with Gold Standard 100% Casein Drink Mix. The Creamy Vanilla flavor delivers great taste 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.