GNC AMP Mass XXX is a protein-packed dietary supplement clinically proven to help increase lean muscle mass with 40% fewer sets. It contains 50g of fast-, medium-, and slow-digesting proteins, 11g of BCAA, 750 calories, carbohydrates, and healthy fats for advanced muscle performance. The Creatine Matrix Blend with 3 forms of creatine supports muscle protein synthesis, while micronized amino acids fuel muscles and support key processes crucial to muscle growth and repair. This gluten-free supplement is naturally and artificially flavored with a delicious chocolate taste.