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Description
J Biol Chem 275(51):4051740528

In vitro work using LED photoirradiation of fibroblast cultures demonstrated that copper peptide supplementation significantly increased collagen synthesis compared to untreated controls, suggesting a synergistic interaction between GHK-Cu and cellular bioenergetic pathways

But the active ingredients in all these products are the same, the only difference being some have an citric acid "buffer" and some do not

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