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But if you just want the fast answer, most research shows GHK-Cu to be the more broadly studied copper peptide for both hair and skin

[11]Mendoza-Czatl D, Loza-Tavera H, et al

Published half-lives are central tendencies drawn from defined study populations, usually healthy adults under controlled conditions

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45 The second step is an irreversible rate-limiting reaction catalyzed by branched-chain -keto acid dehydrogenase (BCKDH), which is phosphorylated and inactivated by the specific kinase BCKDH kinase (BCKDK) and dephosphorylated and activated by Protein phosphatase 1 K (PPM1K)