Copper Peptide GHK CU, AHK CU Peptide Hair Growth Treatment Serum Dual Peptides eBay GHK Cu is one of my personal favorites for a lot of reasons, but I can say without a doubt that it's use effectively stopped and reversed, my receiving hairline. However, there are GHK Cu is one of my personal favorites for a lot of reasons, but I can say without a doubt that it's use effectively stopped and reversed, my receiving hairline. However, there are Peptide Therapy for Hair Growth: Explore Your Options GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia Thermodynamically stable ionic liquid microemulsions pioneer pathways for topical delivery and peptide application ScienceDirect