Copper Peptide Barrier Cream Yunasence GHK Cu with Ceramides YUNASENCE 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 (Copper Peptide) is a naturally occurring peptide in the body that binds with copper to support cell repair and renewal. As we age, our levels decrease and thats where supplementation or GHK Copper Peptide GHK Cu Tripeptide 1 Unlock Youthful Skin: GHK Cu Peptide Benefits