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It's an in-vitro finding - cells in a dish, not people

Liver and Lungs: GHK-Cu reversed age-related gene expression changes, restored healthier tissue function, and improved outcomes in COPD models (PMID: 24166485)

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however, concluding the reasons for the observed changes is a complex task

Gholamhoseinian, A., Moradi, M

Randomised Phase 2 study of maintenance linsitinib (OSI-906) in combination with erlotinib compared with placebo plus erlotinib after platinum-based chemotherapy in patients with advanced non-small cell lung cancer