Branched-chain amino acids are three of the twenty amino acids used to synthesize human proteins, namely leucine, valine and isoleucine, which are essential amino acids. The reason why they are called essential amino acids is that they cannot be synthesized by the body under normal conditions and need to be transformed into a useful component of the body through external food, so it is important to pay attention to supplementing branched chain amino acids during exercise. Branched-chain amino acids are different from other amino acids in that they provide energy directly to the muscles, which is more sought after by sports enthusiasts. Branched-chain amino acids are consumed during exercise to provide energy directly, which reduces excessive muscle breakdown and protects the muscles. Another benefit is that branched-chain amino acids can relieve fatigue and eliminate the feeling of tiredness, which is good for the body’s recovery after exercise and helps to promote repair and improve the efficiency of exercise. So branched-chain amino acids have many benefits and must be supplemented in time.