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Clinical References 1 Wilding JPH, et al
Copper Peptide Products Versus Retinoids and Cosmetic Actives Cu-GHK has been compared with vitamin C and retinoic acid in a small collagen-production context summarized in a topical peptide review, where collagen increased in 70% of Cu-GHK-treated participants versus 50% with vitamin C and 40% with retinoic acid after one month [2]
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[1] [2] These sites are selected based on adequate subcutaneous tissue depth, ease of access, and established safety profiles from clinical trials
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