BREAK IT DOWN GLOW STACK is just one of the many different types of peptides we offer as a part of our PEPTIDE THERAPY PROGRAM! DID YOU KNOW? This peptide GHK Cu (50 MG) Sigma Compounds GHK Cu, commonly known as copper peptides, are found naturally within the human body where they play a vital role in skin repair and maintenance. Copper peptides support optimal skin function by helping Amazon.com: GHK Cu Copper Peptide Supplement, 120mcg High Purity Supplement for Skin & Hair, Enteric Coated for Maximum Absorption, Vegan & Gluten Free (60 Count) : Health & Household