GHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair 12 Week Supply (30 mL) What is GHK Cu and Why is Everyone Talking About It? GHK Cu (Copper Peptide) is a powerful, naturally occurring compound in the body that plays a key role in skin health The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, Copper Peptide (GHK CU) Serum Australian Private Label Skin Care Cellular Cosmetics