n acetyl cysteine vs glutathione N-Acetyl (NAC) is one of the most studied drugs in the market. There's so much research on it and here's one that I came across. It plays a major role in NAC Supplement (N-Acetyl Cysteine) -

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The protein expression ( Figures 3BD ) show that B7-H3 is highly expressed in glioblastoma also on protein level

Other indirect evidence also comes from the coordinated response of enzyme activities and corresponding gene expression that is often observed in response to stress

Much of the modern enthusiasm for GHK-Cu traces to a body of gene-expression work suggesting the peptide can influence the activity of a very large number of human genes, with reviews describing modulation of thousands of gene sets involved in tissue remodeling, inflammation, and repair