GHK-Cu peptide is a naturally occurring copper-binding tripeptide first isolated from human plasma in the early 1970s by Loren Pickart and colleagues. Its full chemical name is glycyl-L-histidyl-L-lysine copper(II) https://matteolipy269876.blogtov.com/21982089/what-is-ghk-cu-peptide-structure-science-research-use