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 Conformational restriction blocks glutamate receptor desensitization Nature Structural & Molecular Biology Ligand induced desensitization of serotonin 5 HT2C GPCRs Receptor down Regulation an overview ScienceDirect Topics