GHK Cu (Copper Peptide) Deep Dive: Mechanisms, Benefits, Risks, Forms, & Dosing 7 days on GHK Cu. Here's my honest update. I'm not going to hype this up because the real results don't even start until week 46. But something is already happening. Can GHK Cu Be Taken Orally? Oral GHK Cu Bioavailability, Tablets & Copper Peptide Safety Neurogan Health GHK Cu, the copper peptide is world renowned for just one thing, and thats for what it does for your skin. It does so much more for your overall well being. If youre trying to start your peptide GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective?