GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu Before and After: See Fine Lines and Wrinkles Fade Fast Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with 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 Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B Copper Peptide (GHK Cu) 2% Recovery Serum