GHK-Cu exists as a 1:1 copper(II):peptide complex in which the Cu(II) ion is coordinated by the glycine terminal amino group, the amide nitrogen between glycine and histidine, the histidine imidazole nitrogen, and the lysine side chain amino group in a square planar arrangement
Moreover, since oxidative stress and neuroinflammation play crucial roles in regulating hippocampal neurogenesis [27], it is plausible that cognitive function impairment in chronic hypobaric hypoxia could stem from their disruption of hippocampal neurogenesis
Which is where we were before I got sidetracked
One source says Selank is the answer
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The three amino acids cysteine, glutamate, and glycine combine to form the tripeptide glutathione