BPC 157 NAD+ GUK Cu Peptide Patch Medical Imaging and Therapeutics Skn Elements Unlock the Power of Peptides & NAD+ at Skn Elements NAD+ + GHK Cu One could support cellular energy + longevity the other could support repair, collagen + glow. Both could be the ultimate inside out upgrade. Because looking better is cute 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack?