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Additionally, experts recommend avoiding harsh actives (e.g., retinoids, alpha-hydroxy acids, salicylic acid, etc.), vitamin C, or any active exfoliants while using GHK-Cu peptides

Some users report a skin purging phase during the first 1 to 2 weeks of topical use

GHK-Cu is discussed here in the context of published research, clinical trials, and user-reported observations

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