A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK cu Topical cream : r Peptidesource GHK CU Topical & Sub! : r Peptidesource Copper TriPeptide 1, A miracle ingredient that helps restore hair growth from the roots. Try KERAGENE Hair Growth Booster serum with GHK Cu aka Copper TriPeptide 1 in its more effective form to accelerate hair GHK Cu (copper peptide) used topically is one of the most well studied skin repair peptides. Here's how it helps the skin, in practical terms: 1. Boosts collagen & elastin GHK Cu signals your skin