BCAAs （Branched chain amino acids） 支鏈氨基酸 

支鏈胺基酸是運動營養產業的新寵－而且大多有充分的理由。 眾所周知，支鏈胺基酸可直接被肌肉細胞和免疫系統細胞吸收－它們主要用作能量來源（而不是像某些其他胺基酸那樣作為蛋白質合成的主要驅動力）。

基於 BCCA 的產品的典型聲明包括：

· 增強耐力

· 預防疲勞

· 改善心理表現促進身體健康、增強意志力

· 增加能量水平 增強能量

· 改善免疫​​系統功能 加強免疫系統

· 改善運動後恢復（減少肌肉酸痛及減少上呼吸道感染） 促進運動後恢復

BCAAs are the new darling of the sports nutrition industry – and mostly with good reason. The BCAAs are known to be directly taken up by both muscle cells and by immune system cells – where they are used primarily as an energy source (rather than as a primary driver of protein synthesis as certain other amino acids might be).

Typical claims for BCCA-based products include:

·  Increased endurance 增加耐力 

·  Prevention of fatigue 預防疲勞 

·  Improved mental performance增進身心健康、增強意志力 

·  Increased energy levels 增強能量 

·  Improved immune system function 加強免疫系統 

·  Improved post-exercise recovery (less muscle soreness and fewer upper respiratory tract infections) 促使運動後恢復