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Bonelli M, Smolen JS, Scheinecker C

No dedicated membrane receptor or intracellular binding protein for GHK-Cu has been definitively identified and pharmacologically characterized, which is why the copper-shuttle model, rather than a receptor-occupancy model, dominates mechanistic discussion

doi: 10.1016/j.jplph.2013.06.005

Patients with chronic fatigue syndrome performed worse than controls in a controlled repeated exercise study despite a normal oxidative phosphorylation capacity

But no because the legHB that the yeast cells crank out is identical, amino-acid-by-amino-acid, to the protein from soybean root nodules

It is found in the retina, cerebral cortex, amygdala, hypothalamus, and pituitary