AHK CU + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum Dermatologist TestedGHK CU Copper Peptide Serum for Hair Growth Thicker Fuller Hair in 8 Weeks Scalp Essence for Stronger Roots USA Design TikTok Shop 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.