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For quantitative analysis, probes must also discriminate GSH from structurally similar thiols such as cysteine and homocysteine

GHK-Cu is the copper(II) complex of the tripeptide glycyl-L-histidyl-L-lysine (CHCuNO, 403.9 g/mol, CAS 89030-95-5)

Some researchers substitute MK-677 for the Ipamorelin component, producing a hybrid where MK-677 provides the sustained GHSR signal and injectable CJC-1295 provides the GHRH amplification

Gastroenterology 130 (3), 687694

A typical protocol involves 1 to 2 mg GHK-Cu subcutaneously, administered 30 minutes before bed

There are also legal considerations because neither peptide is FDA-approved for human use in this manner