GHK Cu (copper peptide) used topically is one of the most well studied skin repair peptides. Here's how it helps the skin, in practical terms: 1. Boosts collagen & elastin GHK Cu signals your skin ENHANCED EXTENDS PEPTIDE PLATFORM WITH TOPICAL GHK CU, FORMULATED UNDER MEDICAL COMMISSION OVERSIGHT Enhanced GHK Cu Topical vs Injection Which is the Better Copper Peptide Form? Copper Fusion Cream Watts Beauty USA GHK Cu Peptide Serum 30 ml, Copper Peptide Serum with Hyaluronic Acid for Tightening, Collagen Boosting