Musk is a secretion in the musk deer's navel. In Chinese medicine, it plays an important role as an "assistant," helping the medicine spread throughout the body, as a hsing ch'i or promoter of circulation. Many medicines rely on musk to come fully into play, and so it is currently used in considerable amounts.
麝香是麝肚臍分泌物，在藥材裡，它扮演重要的「佐使」角色，協助藥劑在身體行走、擴散，所謂的「行氣」，許多藥欲發揮藥效，必須靠麝香，因此目前用量還不小。