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Description
Good technique paired with good sourcing is what keeps peptide research reproducible

Palanisamy, and M

GHK-Cu (Glycyl-L-Histidyl-L-Lysine Copper) is a naturally occurring copper-binding peptide found in human plasma, saliva, and tissues
Vague labeling like "copper peptide complex" without percentages is a red flag

Bostom AG, Roubenoff R, Dellaripa P, Nadeau MR, Sutherland P, Wilson PWF, Jacques PF, Selhub J, and Rosenberg IH (1995b)