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5 Appetite, satiety, and behavioral peptide systems revisited Regulation of appetite and feeding behavior represents one of the most extensively investigated yet paradoxically undertranslated domains of peptide biology

The healing-promoting properties of GHK-Cu may help reduce post-acne scarring and hyperpigmentation

It does not impair local immune function in the urogenital tract

Both ingredients are active, both can cause initial irritation, and using them simultaneously may overwhelm sensitive skin

Even spacing products minutes apart within the same routine can create interactions that destabilize both ingredients