Branched-chain amino acids (BCAA): consisting of leucine, isoleucine and valine, are essential amino acids that the human body cannot synthesize on its own. They effectively promote muscle protein synthesis, aiding in muscle building. During high-intensity exercise or insufficient nutrition, they can effectively reduce muscle breakdown. BCAA also provide energy for the body, enhance exercise endurance, relieve exercise fatigue and accelerate physical recovery. They are an ideal nutritional supplement for athletes, fitness enthusiasts and those needing to enhance muscle strength.