Intense physical training demands comprehensive protein support – day and night. Our Gold Standard 24 Pak Whey/Casein Protein Stack provides the fast-acting Ion-Exchange and Microfiltered Whey Protein Isolates of 100% Whey Gold Standard for pre- and post-workout support, along with the slowly digesting Micellar Casein blend from Gold Standard 100% Casein for between meals and right before bed. Both provide 24 grams of high-quality enzyme fortified protein for round-the-clock muscle building and recovery. And, to make sure every shake is mixed to perfection, our new Gold Standard 24 Pak comes with a FREE custom ON shaker cup.