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Higher is not automatically better, and beyond a certain point additional GHK-Cu mostly adds irritation risk, cost and the potential for a bluish or brownish tint on the skin
We simply dont know enough to make such bold statements
Skin that is easily red, reactive, or stressed by the environment may respond well to this peptide
(10 g or 10 ng/kg/day), topical (1.0 g in cream), or per-oral (0.16 g/mL in drinking water) over 90 days and described directional improvements across biomechanical, functional, macroscopic, and histological endpoints, though specific effect sizes and p-values are not reported in the abstract
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