Overall, whether used for acute exacerbations or over extended periods at higher doses (e.g., 6001,200 mg/day for COPD), NAC is generally very well-tolerated
The effects vary based on the type & how your body reacts to glutathione
Abraham J, Prajapati SI, Nishijo K, Schaffer BS, Taniguchi E, Kilcoyne A, et al
[Phosphorylation and activation of glutathione peroxidase and glutathione-S-transferase by cAMP-dependent protein kinase]
According to a 2004 study, Your body also produces L-carnitine naturally from the amino acids methionine and lysine if your stores are low