What is GHK Cu and Why is Everyone Talking About It? GHK Cu (Copper Peptide) is a powerful, naturally occurring compound in the body that plays a key role in skin health GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B Serum GRO GHK CU 4% AHK CU 1.5% (Hair Follicule in vitro Research) NexXGeN Peptides Amazon.com: 5 Amino 1mq Supplement Capsules 500MCG 60ct (3RD Party Tested) : Health & Household 99% AHK Cu Powder Hair Growth & Anti Aging Formula Bulk Naturals Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum eBay