Dosage Information GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true? Copper peptide, known as GHK Cu, has Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3 Dr. Brenner Labs The GHK Cu Peptide: Benefits, Uses, and Why it's Known as the Regenerative Copper Complex Copper Peptides (GHK Cu): Benefits and Side Effects