Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit I've been getting a lot of questions about GHK Cu, so here's a quick breakdown. GHK Cu is a copper peptide that naturally occurs in the body and plays a role in skin repair The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, Peptide Dosing Sheet Ghk 100mg TikTok