This peptide reverses aging And it's been hiding in plain sight for decades. GHK Cu (Copper Peptide) is one of the most researched anti aging ingredients out there. Here's what it does: Boosts GHK Cu Peptide Before and After Results Copper Peptide Hair Growth Treatment GHK cu, AHK cu, Licorice Root Extract, Ginseng Root Extact AHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair Discovery Size (10 mL) AHK Cu Active Peptide