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Ingredients to Avoid When Using Copper Peptides To maintain the integrity of GHK-Cu, its best to avoid layering copper peptides with: High-strength AHAs or BHAs Strong Vitamin C (ascorbic acid or ethyl ascorbic acid) Retinoids or retinol derivatives Low-pH exfoliants These ingredients can reduce peptide activity or increase irritation, especially for sensitive skin

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Food and Chemical Toxicology , 37 (910), 973979

[PMID: 9149058] PubMed record related to this compound for laboratory literature review