GHK Cu Copper Peptide Serum 1% Black Tie Health GHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair 12 Week Supply (30 mL) Peptide Therapy for Hair Growth: Does It Really Work? IK Clinics Copper Peptides for Effective Hair Growth So excited about this peptide! GHK Cu serum and scalp solution available Fascinating peptide that helps to prevent and reduce fine lines and wrinkles. Applied topically on the scalp for hair growth.