serum creatine

例句：

1. 1. This supplement is designed to help athletes improve their performance.
   这款补充剂旨在帮助运动员提高表现。
2. 2. The body needs a certain amount of Creatine to function properly.
   身体需要一定量的肌酸以正常运作。
3. 3.Creatine supplements are often used by athletes during intense training sessions.
   在高强度训练期间，运动员经常使用肌酸补充剂。