Doctor"s Best BCAA powder stimulates muscle growth, prevents muscle breakdown, helps prevent exercise-induced fatigue and increases preferential loss of body fat. Doctor"s Best BCAA Powder provides the clinically proven ratio of the branched chain amino acids - leucine, isoleucine and valine. BCAAs are vital for muscle protein synthesis. BCAAs act as constituent proteins for the building of muscles and their presence activates signaling pathways for muscle growth. Supplementation with BCAAs prevents fatigue during exercise by attenuating the decline of circulating levels of BCAAs. This Doctor"s Best item contains no added colors, flavors, fillers, additives or unnecessary ingredients. Non-GMO and Gluten Free.