It can result in blisters and a rash or even become a life threat
What Published Mechanism Research Implies (And Doesn't) GHK-Cu's documented activities stimulating fibroblast proliferation, modulating collagen and glycosaminoglycan synthesis, affecting gene expression at scale (Pickart & Margolina describe an effect on roughly 31% of human genes, PMID 29986520) are mechanism findings, not adverse-event predictions
Conversely, M2 macrophages are considered iron donors (Fig
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J Neuroinflammation 13(1):83 Hou T-T, Yang H-Y, Wang W, Wu Q-Q, Tian Y-R, Jia J-P (2018) Sulforaphane inhibits the generation of amyloid- oligomer and promotes spatial learning and memory in Alzheimers disease (PS1V97L) transgenic mice
This means fewer dark spots, more even skin tone, and that coveted "inner glow" that no amount of makeup can replicate