GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK Cu Side Effects, Complications, and Risk Profile GHK Cu (Copper Peptide) Deep Dive: Mechanisms, Benefits, Risks, Forms, & Dosing Dr Tahera explains that the topical version of GHK Cu and how it supports skin repair and rejuvenation. This is the cream based approach. Injectables? We'll cover that next. Because understanding your options matters.