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Who Should Be Cautious While GHK-Cu is well-tolerated by most skin types, a few groups should proceed with extra care: Wilson's disease patients

They are primarily considered for research and are often used "off-label" in clinical settings

10.1016/j.colsurfb.2019.110463 Psarski M, Pawlak D, Grobelny J and Celichowski G

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Fast Answer GHK-Cu peptide is a copper-bound form of the tripeptide glycyl-L-histidyl-L-lysine that is studied mainly for skin biology, collagen synthesis, wound healing, and related dermatology uses [1], [2]