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INTRODUCTION: GHK-Cu and HA are two commonly used skin care ingredients, both of which were reported to enhance collagen synthesis

Its cytoprotective mechanisms in this context are multifaceted: it bypasses the prostaglandin pathway, maintains endothelial integrity to ensure blood flow to the mucosa, and directly stimulates the cellular processes required for repair

It stimulates collagen synthesis, modulates the repair genes that naturally decline with age, and controlled studies document real improvements: 20-30% gains in skin firmness and fine lines over 12 weeks at standard concentrations