Helps support muscle rebuilding & recovery. Energizing. Muscle maintenance. Helps build muscle. On-the-go use. In-between meals. Post-workout recovery. The Science Behind Protein: Muscle Milk Pro Series contains a combination of high-quality stow releasing and fast releasing proteins to help increase amino acid levels. Essential amino acids, including leucine, play a role in muscle growth. Protein also helps support muscle rebuilding and maintenance of muscle mass. Muscle Milk protein powder supplements offer quality you can trust. Notice: Product sold by weight, not by volume, contents may settle during shipping and handling. Please recycle.