The Skin & Hair Stack GHK Cu Copper Peptide Bundle Neurogan 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, Hair & Scalp Serum, 2 oz (60 ml) AHK CU + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml)