Why use Mass Protein Blend? Combining whey concentrate, whey protein isolate and soy protein powders with added BCAAs and digestive enzymes, our premium protein blend is quickly absorbed by the body - particularly muscles post-workout. Who can benefit from taking a protein blend? Taken as a post-workout shake, Mass Protein Blend can contribute to the maintenance and growth of muscle mass in those who follow progressive resistance training regimens, as well as anyone looking to generally increase their protein intake throughout the day.