Peptide Therapy for Hair Growth: Explore Your Options Lets talk about GHK Cu beyond the marketing., Copper peptides are often positioned as anti inflammatory and universally regenerative., And in many patients, they are., But biology is not linear., Cu GHK vs Tretinoin: The Anti Aging Showdown 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