GHK cu is a copper peptide. It's great for skin, especially when you combine it with other things. My favorite is DMSO and derma rolling. My first experience with copper peptides was Procytes New insights on the skin stack I posted earlier this year. RECAPPING: GHK Cu was developed by a company called Procyte in the 90's. I was an interested follower of Dr. Pickart's work GHK Cu (50 MG) Sigma Compounds GHK cu is a copper peptide. It's great for skin, especially when you combine it with other things. My favorite is DMSO and derma rolling. My first experience with copper peptides was Procytes GHK Cu Uncovered A Comprehensive Guide to Anti Aging, Wound Healing, and Biohacking Protocols: Unleashing Peptide Science for Collagen Regeneration and Athletic Recovery (Peptide & SARMs Guides): Pierce, Gavin: 9798280350304: Amazon.com: Books DUO Hair Growth Serum and Scalp Rejuvenation Pure Prescriptions