GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend 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 So excited about this peptide! GHK Cu serum and scalp solution available Fascinating peptide that helps to prevent and reduce fine lines and wrinkles. Applied topically on the scalp for hair growth. Ghk Cu Stretch Marks Before And After