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Evidence suggests GHK-Cu may enhance dermal fibroblast function, collagen synthesis, and extracellular matrix remodelingfactors that contribute to skin firmness, elasticity, and texture

Cucinotta D, Vanelli M

Dose relevance and interpretation in a human exposure context A critical challenge in interpreting the real-world relevance of current in vivo evidence on PET MNPs is the very broad range of administered exposure levels across the included studies (Table 3), which are reported using different metrics (e.g., concentrations in exposure media such as drinking water or food, or administered doses normalised to body weight)

This is due to the digestive process, which can break down a portion of the vitamin before it reaches your bloodstream