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Maquart and colleagues reported stimulation of collagen synthesis in fibroblast cultures by GHK-Cu, while later work connected GHK-Cu to matrix remodeling enzymes and inhibitors [4], [5]

& Vanden Berghe, T

Pregnancy and breastfeeding should avoid GHK-Cu due to lack of safety data for these populations

The key difference is that retatrutide provides triple agonism (GLP-1 + GIP + glucagon) while semaglutide provides only GLP-1 agonism

Injectable GHK-Cu vs Topical Formulations GHK-Cu is available in both topical creams and serums and injectable formulations

The effect of the human peptide ghk on gene expression relevant to nervous system function and cognitive decline