Brand: Pro Nutrition EXTREME MASS RAPID MUSCLE BUILDING FORMULA is packed with protein, complex carbohydrates and amino acids designed to help you to gain lean mass fast! The precise combination of proteins in this formula is designed to supply the amino acids needed by the body for the repair and growth of muscle tissue. Complex carbohydrates are included to provide energy for intense workouts, as well as to assist in muscular recuperation and restoration of glycogen reserves. Extreme Mass is used by bodybuilders, athletes and individuals of all ages to assist in increasing muscle mass.