National Council on Strength & Fitness
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Branched Chain Amino Acid Supplementation
Branched Chain Amino Acid Supplementation
Popular bodybuilding websites that promote products for muscle mass suggest that branched chain amino acids (leucine, valine, and isoleucine) are so key to muscle hypertrophy that they are a requisite dietary supplement to mass gain. Other claims include branched chain amino acids are needed by athletes to fuel exercise, spare glycogen, increase protein synthesis, reduce protein loss during exercise, reduce muscle soreness, reduce fatigue, improve immune function, and consequently improve performance from potentially any of the above. Although a lack of supportive evidence has been demonstrated in controlled trials, fitness enthusiasts, body builders, and athletes still use the dietary supplements in hopes of gaining a training edge.
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