Heavy Branched Chain Amino. Black Skull brings the new BCAA Powder it has faster absorption and helps fight muscle fatigue during training, besides, with the new BCAA Powder you can control the concentration of BCAAs you want to take. Even the most serious of lifters are left wondering why they need to take additional amino acids when they are already getting so many amino acids in all the protein they are consuming. The truth is that individual amino acids can influence muscle growth through a variety of different pathways, and of all the amino acids none have been shown to be more important than the branched chain amino acids. New studies have shown that dieting groups supplementing with BCAAs (like leucine) increase muscle retention and maximize fat loss much more effectively than non-supplemented groups. That's the bottom line, my friends: more muscle retained, and a greater percentage of lost body fat.