GHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair 12 Week Supply (30 mL) The Science and Benefits of GHK Cu Peptide: Skincare, Hair Growth, and Beyond GHK Cu (Copper Peptide) has emerged as one of the most promising regenerative peptides for hair restoration due to its ability to stimulate follicular activity, improve scalp circulation, reduce inflammation, and prolong the GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect