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doi: 10.1016/0167-4781(91)90133-7

doi: 10.1177/096032719501400102
The molecular pathways involved, PI3K/Akt, VEGFR2, MAPK, NF-kB, and TGF-beta, are well-established pathways in cellular biology with extensive independent validation

The published research numbers (55.8% wrinkle volume reduction, 28% collagen density increase, 70% procollagen response rate) are more reliable indicators of what GHK-Cu can do than any photo grid
