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Description
This is the closest relevant concern with GHK-Cu but it is a copper accumulation question, not a peptide question

When a too high concentration of antioxidants (e.g., ascorbate) is used, a switch from antioxidant to prooxidant behavior may occur, especially under certain conditions (e.g., highly oxygenated tissues such as lungs or the presence of redox-active metals such as Cu or Fe)

E., Mishra A., Collins M

Molteni et al
