No, injectable GHK-Cu is not currently considered safe
Davies TF, Concepcion ES, Ben Nun A, Graves PN, Tarjan,G
Through a process called S-glutathionylation, glutathione also regulates major DNA repair proteins, such as the Ku70/Ku80 heterodimer used in Non-Homologous End Joining (NHEJ) to repair double-strand breaks
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J Intern Med 290(2):257278 Demase K, Monitto CK, Little RD, Sparrow MP (2023) The role of low-dose oral methotrexate in increasing anti-TNF drug levels and reducing immunogenicity in IBD