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Amino acids are the building blocks of protein.
What They Do Along with the other amino acids, the branched-chain acids are the raw material used by the body to manufacture human proteins. These proteins are a vital component of all the body's cells. Scientific evidence shows that branched-chain amino acids may help restore muscle mass following surgery, an injury, or trauma. They also help in people who have liver disease. There currently is no evidence that extra branched-chain amino acids are beneficial for healthy individuals.