11 BEFORE & AFTER ideas copper peptides, crepey skin, eyebrow lift 2 weeks in on GHK Cu and the glow is REAL. Brighter complexion More even skin tone Less breakouts Softer fine lines Thicker, fuller hair This is just 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 A Dermatologist's Take on the Copper Peptide (GHK Cu) Skin Care Trend Cu Peptide Before and After: What to Expect for Skin and Hair