GHK is promising biology, not magic medicine., Most real human data is topical, not systemic., And there are people where caution matters:, Active or recent cancer, Copper imbalance or metabolism Resetting Skin Genome Back to Health Naturally with GHK Springer Nature Link Mitigating GHK Cu Injection Pain: Tips and Tricks Gabriel Alizaidy, MD, MS posted on the topic LinkedIn GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link