Micellar Proteins, Stimulate Muscle Synthesis, Leanlipids, Designer Fats Promote Leanness, Complete A-B Caseins, Peptides and Lactalbumins, Trigger new Growth, Lactoferrin, Increase Oxygen Delivery, Growth Peptides, Boost Nitrogen Balance.New Lower Fat Reduced Calorie Formula, 33 percent less fat than original Muscle Milk.America's Favorite Protein Drink! When Muscle Milk was first introduced, CytoSport scientists attempted to emulate one of nature's most anabolic, complete, and balanced food's human mother's milk. Muscle Milk broke the mold, creating a new category of protein supplement while setting a new standard for both taste and performance. As a result, Muscle Milk has become America's favorite protein drink. But the science of human metabolism is never static, our understanding of its complexity is expanding everyday.