ghk-cu texas Copper Peptide Moisturizer – Anti-Aging Face Cream SYNTHEX LABS GHK-Cu Copper Peptide

This discussion compares tripeptides, exemplified by the well-studied GHK, with larger peptides such as the cyclic heptapeptide CyRL-QN15, the human cathelicidin-derived antimicrobial peptide LL-37, and the peptide Andersonin W-1 (AW1), containing 7, 37, and 72 amino acids, respectively [25, 67, 68]

Science 2022;375:1254-61

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

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Zool Sci

Additionally, the peptide was reported to outperform a product containing vitamin K, vitamin C, and retinoic acid [10]