Amino acid supplements, also known as BCAA (branched-chain amino acids) supplements, are dietary supplements that are commonly used by athletes, fitness enthusiasts, and people who want to increase their muscle mass and improve athletic performance. Amino acids are the building blocks of protein, and are essential for muscle growth, repair, and recovery.

Amino acid supplements usually contain a combination of essential amino acids, such as leucine, isoleucine, and valine, that are believed to promote muscle protein synthesis and reduce muscle breakdown. They may also contain other non-essential amino acids, such as glutamine and arginine, that are believed to support muscle recovery and immune function.

The idea behind amino acid supplements is that they can help improve muscle growth, reduce muscle soreness, and enhance exercise performance