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Presented for research literature review only Zhang XN et al
This suggests that excessive GHK-Cu (or other copper peptides) might theoretically push skin MMP-1 concentrations beyond levels supporting healthy collagen production into ranges associated with collagen fragmentation and breakdown seen in older skin with naturally elevated MMP-1
In a peptide market where product purity varies widely and many brands provide no testing documentation at all, this is a meaningful differentiator worth weighing
How It Works GHK-Cu creams and serums penetrate the epidermal and dermal layers, where they directly influence fibroblast activity, collagen production, and cellular repair mechanisms in the skin
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