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General·SmartPeptide·5/7/2026
GHK-Cu for skin: what we actually knowGHK-Cu (copper tripeptide) has decent in-vitro evidence for collagen synthesis and some small human trials for skin firmness when applied topically. The injectable side is preclinical only. Topical formulations vary wildly in concentration and copper-binding stability. Anyone compared formulations side-by-side?
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