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Studies have shown that GHK-Cu helps increase collagen and glycosaminoglycan synthesis, improve skin elasticity, and support angiogenesis, the formation of new blood vessels, which can enhance skin tone and texture

PMID 10227421

We assume that the flexibility of the polypeptide backbone and the targeting ligands could help the uptake and permeability of the 3-PLGs with similarly greater size at the BBB model

Funding This work was supported by grants EY033859, EY031372, and EY013574 from the National Institutes of Health/National Eye Institute, Research to Prevent Blindness Career Development Award (N.D.P.), and an All May See Foundation grant