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Formulation Considerations GHK-Cu is generally best suited for gentle, water-based formulations and is typically avoided in highly acidic formulations containing: Strong exfoliating acids Low-pH formulations High-strength Vitamin C formulations Low-pH environments may destabilize the copper-peptide complex and influence formulation stability

PMID: 25995620

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Clinical data showed that participants who skipped titration steps or escalated too quickly experienced nearly double the rate of gastrointestinal adverse events