A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend Peptide GHK CU Cream Concierge MD Definitive Guide on Peptides for Skin and Hair Care Infusion Clinic ABQ Why is the injection site painful after administering GHK Cu (Glycyl L Histidyl L Lysine Copper) 2mg mixed with normal saline? GHK Cu: My secret weapon for skin, hair, and healing, I use it two ways topical cream for my face, and subQ injections 3x a week., It boosts collagen, tightens skin, helps hair grow, and even