BCAA is one of the most popular supplements on the market today. However, as recent studies have shown, leucine is the most powerful driving force in this trio. This amino acid, in the way of complex metabolic pathways, initiates the whole cascade of biochemical processes in order to start and increase muscle anabolism. Leucine is also a strong stimulator of insulin, growth hormone, testosterone and insulin-like growth factor - that is a whole galaxy of anabolic and anti-catabolic compounds. As it was found out, leucine is also effective transporter of nutrients. Leucine probably also works for more effective and efficient reduction of fat tissue.