BCAAs consumed during training raise both growth hormone and insulin at the same time, hence increased anti-catabolism and anabolism. (More muscle growth and less muscle tissue breakdown.) If you are on a reduced-calorie diet, BCAAs can contribute to a greater loss of fat while maintaining your strength levels. BCAAs lead to relatively higher muscle testosterone levels and an increased ratio of testosterone to cortisol. Using BCAAs during heavy training makes more testosterone available for protein synthesis and increases amino acid uptake for increased muscle growth. This should result with greater increases in lean body mass, muscle and strength gains with some fat loss. The harder you train, the more you need Ultrapure BCAAs.