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Nothing you'd feel right away
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The 1:1 GHK-Cu form gives the classic blue copper peptide identity expected in high-performance cosmetic formulas
References 1 Cosmetics / MDPI (PubMed)GHK and GHK-Cu: the human copper tripeptide, its decline with age and roles in tissue remodeling
The "Copper Uglies" A rare phenomenon called "copper uglies" involves skin appearing temporarily worse before improving
Different sites reduce local irritation, lower the risk of stacked injection-site reactions, and help you tell which compound is causing any reaction
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