Copper Peptide Hair Growth Treatment GHK cu, AHK cu, Licorice Root Extract, Ginseng Root Extact Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum I posted about GHK CU about two weeks ago and had a ton of people ask me questions about it in terms of how it works, but also asking about my personal experience. I am not done treatment yet, but in GHK Copper Peptides for Skin and Hair Defy Medical GHK cu Copper Peptide: The "Glow" for Hair & Skin Seenergie PH