ghk-cu naturally occurring in human plasma levels decline with age GHK-Cu: The Copper Peptide for Skin, Hair & Anti-Aging GHK-CU
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August 19, 2025

[Google Scholar] Engel-Yeger B, Muzio C, Rinosi G, et al
"Since 2010, of the 4,400 sampling records at the Con Edison plant, DEC identified 27 reported exceedances and non-reporting of operational parameters unrelated to the outfall at the facility," it said

This is why its effects aren't just skin-deep