Copper Peptide Hair Growth Serum 10% GHK Cu & 5% AHK Cu Hairgenetix Food Derived TripeptideCopper Self Healing Hydrogel for Infected Wound Healing Biomaterials Research AHK Cu + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan Neurogan Health 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK GHK Cu Copper Peptide: The Ultimate Peptide For Longevity