ZMass Testo Boost BCAA's certainly are a bit different from a number of other Muscle Building supplements. In the place of working to build muscle up, they help prevent the breakdown of muscle during exercise that is intensive. If you are training heavy weights (or during long-duration aerobic fitness exercise) your system has a tendency to enter a catabolic state. This means muscle is currently breaking down for energy uses. Muscle that is breaking down is exactly of what you would like the contrary!