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demonstrated stratum corneum penetration Subcutaneous injection – Used in animal wound healing and systemic studies Intradermal injection – Applied in localized skin research protocols Intravenous administration – Limited use in pharmacokinetic characterization studies Incorporation into biomaterials – Hydrogels, nanoparticles, and delivery systems for sustained release Common Research Models GHK-Cu has been studied across multiple experimental systems: Human cell cultures – Primary fibroblasts, keratinocytes, endothelial cells for mechanistic studies Rodent models – Mice and rats for wound healing, hair growth, and systemic studies Rabbit studies – Wound healing and tissue repair research protocols In vitro systems – Gene expression analysis, protein synthesis, and cellular function studies Human volunteer studies – Limited cosmetic trials examining skin parameters and safety Research Limitations & Regulatory Status Critical Gaps in Current Evidence Despite five decades of research, GHK-Cu faces significant knowledge gaps that limit comprehensive understanding of its therapeutic potential and safety profile