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What is also real is that most topical copper peptide products will not deliver enough molecule to the dermal fibroblast layer to produce the effects the literature describes

It not only removes impurities & tanning but also protects the skin from pollution & environmental damage, making it perfect for daily use in all seasons.

Yao H, Arunachalam G, Hwang JW, Chung S, Sundar IK, Kinnula VL, Crapo JD, Rahman I: Extracellular superoxide dismutase protects against pulmonary emphysema by attenuating oxidative fragmentation of ECM

Chelators can strip copper from the GHK-Cu component, and reducing agents may affect peptide stability during prolonged exposure in the same buffer