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GHK-Cu Side Effects and Safety Potential concerns include: Skin irritation, redness, or sensitivity (with topical use) Variable absorption depending on formulation, but newer research has demonstrated that adding in a transport vessel such as liposomes can help with topical absorption (12)

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[DOI] [PubMed] [Google Scholar] 22.Li X, Lu L, Hou W, Huang T, Chen X, Qi J, Zhao Y, Zhu M