Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true? Copper peptide, known as GHK Cu, has AGELYTIX NMN NAD GHK CU Topical Two power players. Very different roles. Let's talk NAD+ vs. GHK Cu NAD+ works behind the scenessupporting cellular energy, metabolic function, brain clarity, and overall longevity. Think internal optimization, from the inside