Copper Peptide GHK Cu Face Serum AS Wellness by Ageing Solutions 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 Amazon.com: GHK Cu Copper Peptide Serum Anti Aging Face Serum for Skin Firming, Wrinkle Reduction, Hydration & Collagen Boosting, 30ml(1 fl oz) : Beauty & Personal Care GHK Peptide Facial Oil Visibly Younger Skin in 28 Nights KOA LIFE