GHK Cu for Hair Growth? It Works But Only If You Do It Right. Everyones talking about GHK Cu, but heres the catch most serums never make it past your scalp barrier. If the formulas too weak, it Copper Peptide Hair Growth Treatment GHK cu, AHK cu, Licorice Root Extract, Ginseng Root Extact Shed Buy GHK Cu Scalp Peptide Solution Online Take an Rx approach to hair health Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience