Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum GHK Cu Peptide Dosage How to Use Copper Peptides, Injections Neurogan Health GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK CU Research Peptide Alpha Carbon Labs Four reasons this serum belongs in your routine. GHK Cu Peptides that firm and support collagen renewal. Barrier support to keep your skin healthy and resilient. No injection. No needles. No clinic visit.