Most community use is split between topical creams or serums and subcutaneous injection
M.SamaliA
According to the classic two-hits model, the increased insulin resistance, secondary to metabolic syndrome, determines an excessive lipid accumulation in healthy hepatocytes (first hit), mainly through an increased mobilization of free fatty acids from visceral adipose tissue to the liver

in fibroblast culture models it stimulates collagen, elastin, and glycosaminoglycan synthesis at picomolar to nanomolar concentrations (10 to 10 M), and modulates metalloproteinase (MMP-1, MMP-2, MMP-9) activity and their inhibitors (TIMP-1, TIMP-2), functioning as a general regulator of extracellular matrix remodeling ( Mechanistic research establishes that GHK activates TGF- and integrin 1 pathways during tissue repair, attracts immune and endothelial cells to wound sites, and restores gene expression patterns toward a healthier fibroblast phenotype in models of aging and radiation damage ( A 2018 review in IJMS characterizes its role in collagen production, nerve outgrowth stimulation, and dermal stem cell marker expression ( For Research Use Only
Acknowledgements T.F.D
This interaction firmly places concurrent chelation therapy on the list of GHK-Cu contraindications