Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum Copper Peptide 10% GHK CU 5% Hair Growth Serum Price Copper Peptide Hair Regrowth Formula GHK CU AHK CU: Real Results for Thinning Hair in Men PDF) The effect of tripeptide copper complex on human hair growth in vitro Small molecules. Powerful results. Experience Peptide Power with Hairgenetix's advanced Copper Peptide Hair Growth Serum, formulated with 10% GHK Cu and 5% AHK Cu to support hair health at the follicle level. Helps Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum