Understanding the Concentration: Why 3% GHK CU is the Sweet Spot for S Aseir Custom GHK Cu Peptide: Turn Back the Clock Naturally Calibrate Hydration 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 Tripeptide Serum) in Santa Barbara, CA Eternity Health Partners Ghk Cu Shampoo Copper Peptide Hair Growth Best Peptide for Hair Growth Copper Peptide Shampoo