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If skin is dry, applying on slightly damp skin can feel nicerjust keep it consistent so you can judge results
This can cause shear stress and damage the molecules
GHK-Cu vs retinol: which one actually reverses skin aging
There is no pharmacovigilance infrastructure no adverse event reporting, no product recalls, no lot-to-lot consistency testing
The copper ion can undergo photochemically driven changes, and the peptide chain can be degraded by UV radiation
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