Amino acids have attracted much attention in nutritional food additives due to their extensive functions.As the basic building blocks of protein,amino acids support basic nutritional requirements and also play an important role in immune enhancement,muscle repair,and metabolic regulation.Specific amino acids such as leucine and glutamine are particularly critical in improving muscle mass and accelerating recovery.Amino acids also show unique applications in mental health,weight management,and aging by regulating the synthesis of neurotransmitters.