GHK Cu in the NAD+ Push Patch: A Smarter Way to Stimulate Collagen, He Hi, Finch A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend Copper Peptide Hair Growth Treatment GHK cu, AHK cu, Licorice Root Extract, Ginseng Root Extact GHK Cu for hair growth does it actually work? Short answer: no. GHK Cu can be great for skin but when it comes to hair growth, the evidence just isn't there. And this GHK Cu Copper Tripeptide Hair Serum: DHT Blocker, Fuller Looking Hair Soon as 7 9 Weeks 1oz Etsy Cellular Glow Hair Serum 10% GHK Cu + 5% AHK Cu Peptides