Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz 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 Copper Peptide Hair Growth Treatment GHK cu, AHK cu, Licorice Root Extract, Ginseng Root Extact Does GHK Cu Regrow Hair? Here's What the Research Shows GHK CU Copper Peptides for Hair Growth Benefits