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The research discussed involves primarily animal studies, and human clinical data remains limited

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

The cellular uptake of D-CuP NIH/3T3 cells were plated in a 24-well plate (5 10 cells per well) and cultured for 24 h

Current investigations continue to assess how peptide-based compounds interact within multi-pathway signaling environments, including potential influences on coordinated cellular processes and system-level biological responses in controlled laboratory models