The essential branched chain amino acids (BCAA's) include leucine, isoleucine, and valine are metabolised in the muscle, rather than in the liver (26). Leucine may be the most critical BCAA because of its anti-catabolic properties and vital role in protein synthesis (83). So for a training athlete or bodybuilder these amino acids can either be used to build new proteins or be burned as fuel to produce energy. So if the diet has adequate protein then the above "essential" amino acids will be used for protein synthesis which is optimal for increased performance. It should also be noted that, essential amino acids are not produced in the body such as non-essential amino acids, but rather obtained through nutrition & supplementation. It is important to note that AMINO BCAA FUEL is not just for bodybuilders, the BCAA's reduce fatigue in both anaerobic and endurance sports. Scientifically formulated to help: Build Muscle, Enhance Performance, Fat Loss, Improve Concentration, Improve Endurance, Improve Recovery, Increase Energy, Increase Strength, & Increase Energy.