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PMID: 117 CaterHLGittermanDDavisSMBenhamCDMorrisonBRSundstromLE

The main difference comes down to one critical factor: absorption

MMPs normally regulate collagen degradation, with MMP-1 specifically implicated in the initiation of collagen fragmentation. A 2024 study found that elevated MMP-1 levels contribute to aging skin, causing in mice: A 2016 study showed that GHK-Cu significantly increased gene expression of MMP-1 and MMP-2 at the lowest concentration. Researchers attributed this as one mechanism by which the peptide increased collagen and elastin production

The tirzepatide compound dosage chart lays out this progression clearly