GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? 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 Peptide Therapy for Pain Management and Healing Core Medical & Wellness Peptide Therapy for Anti Aging, Immunity & Wellness Miami Stem Cell GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B