GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend In the era of Make America Healthy Again, the popularity of peptidesshort chains of amino acids that often act as signalling molecules in the bodyhas risen sharply. Many compounding pharmacies, which produce Amazon.com: GHK Cu Copper Peptide Supplement, Anti Aging & Hair Growth Support, Improves Skin Elasticity & Firmness, Thicker, Fuller Hair, Easy Absorption, Precisely Dosed, 90 Vegan Capsules : Health & Household