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Description
But when you look at the data, it definitely increases adrenaline

In cosmetic product studies, GHK-Cu was found to tighten loose skin, improve elasticity, density, and firmness, and reduce fine lines, wrinkles, photodamage, and hyperpigmentation
Heterogeneity in the molecular composition of excitatory postsynaptic sites during development of hippocampal neurons in culture
(2007) study measured the countereffect directly