What the Research Shows GHK-Cu has been documented to stimulate collagen synthesis in dermal fibroblasts at concentrations as low as 1 to 10 nanomolar, modulate matrix metalloproteinase activity to regulate the collagen remodeling cycle, and promote angiogenesis through copper ion-mediated endothelial cell migration (Pickart et al., BioMed Research International, 2015, DOI: 10.1155/2015/648108)
Toxicol ., 1994 , 10 , 415
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Specifically, tear fluid samples for the GSH assay were diluted fourfold, while undiluted samples were used for the GSS assay to ensure the samples remained within the linear detection range
S McKinley-Barnard, T Andre, M Morita, DS Willoughby