GHK Cu Peptide: Beginner's Guide to Potential Benefits 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 PDF) Regenerative and Protective Actions of the GHK Cu Peptide in the Light of the New Gene Data GHK Cu Copper Peptide Face Tonic (30 mL) Reduces Appearance of Fine Lines Supports Skin Firmness