Recover overnight with Optimum Nutrition Naturally Flavored Gold Standard 100% Casein Drink Mix. This protein powder drink mix is slow to digest and absorb, which is perfect for helping your body refuel every night. Take this powder drink mix to help you recover while sleeping each night. Compared to other proteins, it generally takes longer for our Gold Standard 100% Casein to break down into its amino acid subcomponents. We've created a formula that sets the standard for slow digesting protein support by using only premium micellar casein as a protein source. Fuel up every night and level up with Gold Standard 100% Casein Drink Mix. Our creamy vanilla flavor delivers a premium flavor and high-quality micellar casein protein powder. Optimum Nutrition is part of the Glanbia global nutrition group and has been setting the Gold Standard in sports nutrition for more than 30 years — helping performance-focused athletes achieve their goals. We are proud to say that we are one of the few sports nutrition companies who own and operate our own production facilities. We take as much pride and care in crafting our award-winning supplements as our consumers do with crafting their fitness accomplishments.