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Be careful when combining GHK-Cu with strong actives like vitamin C, retinoids, exfoliating acids, or prescription topicals
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The peptide has demonstrated gene-modulatory effects across 4,000+ human genes, including upregulation of collagen synthesis, stem cell markers, and antioxidant enzymes in cell culture and animal models [3]
It also modulates the activity of matrix metalloproteinases (MMPs) and their inhibitors, supporting balanced collagen remodeling rather than excessive breakdown or fibrosis
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