Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK Cu Copper Peptide: The Ultimate Peptide For Longevity A lot of people asked how I use GHK Cu (copper peptide) with a pen device, so here's a quick tutorial showing exactly how I do it. In this video I show how