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 A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend Sublingual GHK Cu TruHealth Physical Therapy GHK Cu for hair growth does it actually work? Short answer: no. GHK Cu can be great for skin but when it comes to hair growth, the evidence just isn't there. And this