GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy Frontiers Glycyl L histidyl L lysine Cu2+ attenuates cigarette smoke induced pulmonary emphysema and inflammation by reducing oxidative stress pathway GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true? Copper peptide, known as GHK Cu, has Is topical GlycylLhistidylLlysine copper (GHKCu) safe for adults, and what are the risks, contraindications, and considerations for systemic use, pregnancy, lactation, and children?