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This does not automatically prove that the peptide was poor quality, but it does mean the solution has changed visually and should be assessed carefully in a laboratory context

[DOI] [PMC free article] [PubMed] [Google Scholar] 174.Hao ZW, Chen TH, Wang Y, Feng QY, Chen JY, Li HK, et al

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Most peptide therapy is not covered by insurance, though clinics often offset that gap with transparent, provider-set pricing and HSA/FSA-eligible payment options

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