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Gale J, Aizenman E

It is important to emphasise that these proposals are based almost entirely on preclinical data principally in vitro (cell culture) experiments and animal studies and have not been reliably demonstrated in robust human clinical trials: Stimulation of follicle enlargement: Laboratory studies suggest GHK-Cu may increase hair follicle size, potentially counteracting the miniaturisation associated with androgenetic alopecia (pattern hair loss), though this has not been confirmed in humans

[DOI] [PubMed] [Google Scholar] 3.Pickart L

This approach provides both the systemic gene expression modulation from injections and concentrated local delivery from topical application

Two copper-dependent enzyme systems are central to the tissue-repair narrative

vs Other Peptides Several peptides have documented hair-relevant effects including thymosin beta-4 (wound healing, follicle migration) and PTD-DBM (Wnt activation)