GHK CU Copper Peptide, Face Cream, 2 oz (60 ml) 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 Advanced GHK Cu Face Cream 2400mg 4% Firmer Skin Neurogan Neurogan Health Copper Peptide (GHK Cu) 2% Recovery Serum Amazon.com: Neurogan GHK Cu Copper Peptide Face Cream 4% Peptides for Skin Firmness & Deep Hydration Daily Facial Moisturizer with 2400 MG GHK Cu, 2oz : Beauty & Personal Care