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 Neurogan Health Introduces AHK CU + GHK CU Hair Serum Pro Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum A few years ago, barely anyone was talking about copper peptides now GHK Cu and AHK Cu are everywhere in skincare, biohacking, and longevity conversations. But did you know there are copper peptides Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum