The branched-chain amino acids (BCAA) are three essential amino acids: leucine, isoleucine, and valine. BCAAs cannot be manufactured by the human body, and are therefore nutritionally essential.
BCAAs act as a fuel source for skeletal muscle during times of trauma or stress, help prevent catabolism (the breakdown of muscle for energy)1, while encouraging protein synthesis. BCAAs have been studied as a possible aid for severe burns, trauma and sepsis.2 Branched-chain amino acids are especially popular among athletes and strength trainers for their anti-catabolic properties.
Branched-chain amino acid supplements are available in caplet, tablet, and powder form. Use as directed. Consult your physician before taking a BCAA supplement.
BCAA supplements should not be taken by those who are pregnant/nursing, or by individuals with any serious conditions, including those of the kidney or liver. BCAAs should not be consumed in conjunction with alcohol, and care should be taken when taking in conjunction with anti-depressants (consult your physician).
References: 1. Int J Sport Nutr Exerc Metab. 2007 Dec;17(6):595-607. 2. JPEN J Parenter Enteral Nutr. 1991 May-Jun;15(3):252-61.