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GHK-Cu is a naturally occurring copper-peptide complex composed of the tripeptide glycyl-L-histidyl-L-lysine (GHK) bound to a copper(II) ion

Unlike other growth hormone secretagogues such as GHRP-6 or hexarelin, ipamorelin demonstrates a narrow selectivity profile, stimulating GH release in a dose-dependent manner without appreciably altering cortisol, ACTH, or prolactin levels

43,44,45 PCBP1 and PCBP2 are involved in all aspects of import, export, storage, and utilization and are essential for maintaining cellular Fe 2+ levels

However, most studies conducted so far have been in vitro , with only a few in vivo experiments