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 7% GHK CU ACCELERANT Platinum Skin Care GHK CU Pepora Precision Peptides GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B After a year of using GHK Cu both topically and going deeper than topicals (under my doctor's care), the difference in my skin is not something I have to squint at in good