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Peer-reviewed studies demonstrate that GHK-Cu can: Stimulate fibroblast proliferation and collagen synthesis Increase glycosaminoglycan production Support wound contraction and remodeling Reduce oxidative stress and inflammation A major review published in the International Journal of Molecular Sciences describes GHK-Cu as a compound that resets gene expression to a healthier state, influencing over 4,000 human genes involved in tissue repair and anti-inflammatory processes

Appetite and sleep changes Self-reported appetite shifts (in both directions) and altered sleep difficulty falling asleep, lighter sleep, or vivid dreams are described inconsistently across community sources, with no documented dose relationship

- Those desiring skin whitening through antioxidant action

Primary antibodies targeted FOXO4, Leydig cell markers (StAR, CYP11A1, 3-HSD), spermatogenesis markers (PCNA, PLZF, UCHL1, SCP3), and senescence/apoptosis markers (Ser15-phospho-p53)