100% whey (100% of the protein in this product comes from whey) with probiotics. Muscle milk own your strength. Muscle milk protein powders offer quality you can trust. Energizing. Helps satisfy hunger. Helps build muscle. On-the-go nutrition. Anytime snack. Post-workout recovery. The science behind protein. Muscle milk 100% whey with probiotics contains a blend of high-quality whey protein isolate and concentrate 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. rbST free (No significant difference has been shown between milk derived from rbST treated and non-rbST treated cows). Notice: Product sold by weight, not by volume. Contents may settle during shipping and handling. Please recycle.