GHK Cu is one of the few peptides in this space with genuine randomized controlled trial data. A 2023 split face RCT in 60 participants showed a 22% improvement in skin firmness and 16% Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy
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