Now, researchers think that carnosine helps counteract all that acid build up in your muscles.

现在，研究人员认为肌肽可以避免乳酸在肌肉中堆积。

The culprit seems to be an amino acid in lots of pre-workout supplements called beta-alanine, which your body can use to make a molecule called carnosine, which hangs out in your skeletal muscles.

魁祸首似乎是β-丙氨酸，它是一种氨基酸，存在于许多训前补剂中，体可以用它来形成一种叫作肌肽小分子，这种小分子存在于骨骼肌中。