n acetylcysteine vs s acetyl glutathione N-acetylcysteine (NAC): from Clinical to Anti-Aging NAC Supplements for PCOS, Fertility,

These are anecdotal forum and vendor-comment reports, not trial data, and reports are inconsistent some users describe no effects at all

In Advances in Applied Microbiology 115:65113

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The copper ion is not incidental, it is part of how the molecule delivers both the signal and the material for repair

Its small molecular weight (~390 Da) supports cellular uptake and is reported to enable direct DNA / chromatin interaction at gene promoter regions, consistent with the broader Khavinson bioregulator hypothesis

But "safe to combine" and "optimal for healing" are different questions