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On the other hand, since NAC is an acetylated ( in the lab ) compound, which doesn't exist in nature , or only in almost undetectable traces, it is considered as xenobiotic ( not naturally found in the body )

doi:10.1080/01635581.2011.523494

However, everyone's biology is unique

Differential IKK activation and IB degradation by interleukin-1 and tumor necrosis factor- in human U937 monocytic cells: evidence for additional regulatory steps in B-dependent transcription
