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 GHK Copper Peptide GHK Cu Tripeptide 1 GHK CU Apex Peptide Supply Copper Tri Peptide (GHK Cu) is one of the most researched peptides in skincare, and for good reason. It's a naturally occurring peptide that helps signal the skin to repair and regenerate. As we GHK Cu for Skin: SIGNAL's Guide to Rejuvenation