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Nature Scientific Reports 2016 comparative study showed GHK-Cu produced no cytotoxicity to human keratinocytes at concentrations up to 5,800 M over 72 hours and did not induce inflammatory biomarkers unlike other copper compounds

Injectable GHK-Cu has no proven ability to tighten skin and carries significant health risks, including copper toxicity and infections

Differential desensitization, receptor phosphorylation, beta-arrestin recruitment, and ERK1/2 activation by the two endogenous ligands for the CC chemokine receptor 7

Molecular mechanisms of TDP-43 misfolding and pathology in amyotrophic lateral sclerosis