COPPER PEPTIDES FOR HAIR GROWTH Ultrastrong 10% GHK Cu Formula with Sonora Supply Co. GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml) 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care Seraphime GHK CU Copper Peptide, Face Serum, 1 oz (30 ml) Amazon.com: Neurogan GHK Cu + AHK Cu Hair Serum Pro Lightweight Scalp Serum with Dual Copper Peptides Daily Hair & Scalp Use, Cosmetic Product : Beauty & Personal Care Not all hair serums are built the same This one is powered by a dual copper peptide system GHK Cu + AHK Cu Designed to support: stronger feeling hair improved elasticity