Copper, Collagen, and Controversy: Inside the GHK Cu Buzz 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 What are experiences with GHK CU and Reta peptides in NYC? A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu, the copper peptide, is a game changing injectable for radiant skin and so much more Here's what it can do: Boost collagen for smoother, firmer skin Anti aging