A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B GHK Cu 50mg 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 Peptide GHK CU Cream Concierge MD