GHK-Cu, the copper peptide in countless serums, may do far more than moisturize. A 2018 review argues that new gene-expression data could explain how this one small molecule is linked to collagen building, tissue repair, inflammation control, and even DNA repair. Here's what the paper actually reports on aging skin and regeneration, and where the evidence stops. Before you buy into the hype, read the practical caveats on topical use and what a review can and can't prove.
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