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GHK-Cu has smaller, shorter cosmetic study evidence at 4 to 12 weeks

The clinical trial most often cited is Leyden and colleagues' 2002 randomized 12-week trial of a GHK-Cu facial and eye cream in 71 women with photoaged skin [4]

By Erica Sweeney and Dominic Kesterton Advertisement Advertisement

While this may be due to other therapies that we may have introduced, we believe the supplements may have played a part in this change

In fact, comparing the research using GHK-Cu peptide injection vs topical routes shows that the majority of clinical studies have utilized the topical option to research the efficacy of the copper peptide for cosmetic applications