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Without context, it can be difficult to know what is reasonable, what drives the cost and which option actually fits your goals
For eye-area products, 2% is more appropriate because the skin around the eyes is thinner and more reactive
Christie, J
As Pickart's research group documented: "GHK stimulates blood vessel and nerve outgrowth, increases collagen, elastin, and glycosaminoglycan synthesis, as well as supports the function of dermal fibroblasts" (Pickart et al., 2015)
Selected Data 1) This study performed by the research team of Park et al investigated the protective effects of the tripeptide-copper complex GHK-Cu against lipopolysaccharide (LPS)-induced acute lung injury (ALI), employing both in vitro macrophage cell cultures and an in vivo mouse model