Branched-chain

Branched-chain amino acids (BCAAs) are amino acids with side chains that are non-linear. They include leucine, isoleucine, and valine. BCAAs are among the nine essential amino acids for humans, accounting for 35% of the essential amino acids in muscle proteins and 40% of the preformed amino acids required by mammals.

Structure

BCAAs have aliphatic side-chains with a branch (a central carbon atom bound to three or more carbon atoms). Among the proteinogenic amino acids, there are three BCAAs: leucine, isoleucine, and valine.

Function

BCAAs are used in medicine for a number of purposes. They are used to treat liver disease, improve athletic performance, and prevent muscle wasting in people confined to bed.

Dietary sources

BCAAs are found in foods and whole protein supplements. Good sources include meat, dairy products, legumes, and protein supplements.

See also

• Amino acid
• Protein (nutrient)
• Essential amino acid
• Leucine
• Isoleucine
• Valine

Branched-chain Resources
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