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Typical DFT results for GHK-Cu show strong overlap between copper d-orbitals and nitrogen lone pairs, supporting a square-planar geometry

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Since the response is dose-sensitive and even biphasic, careful studies test a spread of concentrations across several orders of magnitude rather than betting on one number

Sources and further reading FDA, Pharmacy Compounding Advisory Committee meeting materials and briefing documents, July 23-24, 2026 (FDA.gov)

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