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Allergic reactions to GHK-Cu are exceptionally rare, though as with any cosmetic ingredient, individual sensitivities can theoretically occur

Peng W-X, Marchal J, Van der Poel A

[DOI] [PubMed] [Google Scholar] 37.Hieu T.Q., Thao D.T.T

Nanoprobe-based GSH imaging relies on signal-generating reactions triggered by glutathione, and effective tumor visualization requires that these signals clearly differentiate malignant tissue from normal tissue

& Coskuner, E

The nanomolar reality Research from the University of California demonstrated that GHK-Cu at concentrations of 0.01, 1, and 100 nanomolar all increased collagen and elastin production in human dermal fibroblasts