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It combines the naturally occurring tripeptide glycyl-L-histidyl-L-lysine (GHK) with copper(II) to form a small peptidemetal complex that is also found in human fluids and tissue matrices

This article focuses specifically on the topical serum format

Safety and Regulation: Since it is not approved by major regulatory bodies like the FDA for any medical use, its presence in blood when administered as a supplement or drug raises questions about safety, efficacy, and legal implications

It all boils down to the need of the patient, even when the injectables are good but oral supplements are also acceptable depending on the needs of the patient