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Gene expression analyses show that GHK influences genes relevant to nerve growth factors, antioxidant enzymes in the brain, and anti-inflammatory signaling pathways (Pickart et al., 2017)

Copper peptide serums illustrate this evolution particularly well

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Cell 176, 1142

Researchers do not recommend methionine because it causes an increase in homocysteine levels [99]

measured MMP1, MMP2, TIMP1, and TIMP2 gene expression in human adult dermal fibroblasts exposed to GHK-Cu at 0.01, 1, and 100 nanomolar concentrations and found dose-dependent increases in both MMPs and their inhibitors 11