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Under physiological conditions, GHK occurs in equilibrium with plasma copper, forming a GHK-Cu complex, which is treated as the biologically active form of this peptide
This confirms that the copper is actually complexed with the peptide rather than present as a free ion or absent entirely
Thomasova D, Bruns HA, Kretschmer V, Ebrahim M, Romoli S, Liapis H et al
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