About this item Contains (12) 14 fluid ounce bottles of Muscle Milk Pro Series Protein Shake, packaging may vary 40 grams of protein per serving to help support muscle rebuilding, muscle growth, and maintenance of muscle mass Combination of high-quality slow releasing and fast releasing proteins provide a more sustained delivery of protein compared to whey alone Excellent source of 20 vitamins and minerals Vitamin D and calcium for strong bones Essential amino acids, including Leaucine, play a role in muscle growth Uses: Helps rebuild muscle, post-workout recovery, muscle maintenance, in between meals, on-the-go use, energizing Tested for banned substances. NSF certified for sport. NSF screens for more than 200 substances banned by most major athletic organizations Cytosport; Test your limits and exceed your own expectations for physical perfection by using these supplements Ultimate sports supplements Professional formulas