GHK Cu Copper Peptide Hair & Scalp Serum GHK Copper Peptide Concentrate, cumpr ingredient cosmetic GHK Cu Purepep This is my third cycle on GHK Cu., My hair is growing. My nails are strong. My skin has improved. , And now Im focusing on those acne scars from my younger days., And honestly? Theyre starting to go One of my favorite peptides is GHK Cu. It has made such a dramatic impact on my skin in just one cycle I've been shocked! It supports collagen, healing, and overall skin