Do You Actually Need to Cycle Off GHK Cu? (The Honest Answer) Receptor down Regulation an overview ScienceDirect Topics Functional dynamics of G protein coupled receptors reveal new routes for drug discovery Nature Reviews Drug Discovery Journal of Neuroscience Research JNR Neuroscience Journal Wiley Online Library Everyone talks about the glow from GHK Cu Nobody talks about the burn. Yes, GHK Cu gets hyped for tighter looking skin, scar support, collagen support, and regeneration. And the reason people talk about it