GHK Cu (Copper Peptide) Deep Dive: Mechanisms, Benefits, Risks, Forms, & Dosing What Is GHK Cu Peptide? PSA] Finally, a Dr. explains the mechanism behind the "copper uglies" : r SkincareAddiction Some people notice their skin looks worse before it improves with GHK Cu. This temporary phase is often called the copper uglies., #skincare, #ghkcu, #skinhealth, #longevity, #peptides