GHK-Cu for Skin: In skincare, GHK-Cu stimulates fibroblasts to produce collagen and elastin, reduces hyperpigmentation, and improves skin elasticity
However, semaglutide is a single GLP-1 agonist, while retatrutide activates three receptor systems simultaneously, making direct comparisons problematic
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Tirzepatide: Another Relevant Comparison Tirzepatide (Mounjaro/Zepbound), a dual GIP/GLP-1 agonist approved by the FDA, provides another useful reference point
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