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Pharmacokinetics After an oral dose of 400 mg, NAC has a half-life of around six hours and a bioavailability of 410% due to first-pass metabolism (NIH)

It also helps with the digestion of proteins and fats
The mechanistic explanation involves separate receptor systems working in parallel

Kall et al

Biologically important thiol-disulfide reactions and the role of cyst(e)ine in proteins: An evolutionary perspective
