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 GHK Cu Before and After: See Fine Lines and Wrinkles Fade Fast The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference