GHK Cu Copper Peptide Hair & Scalp Serum 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care Seraphime GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect GHK Cu is one of the most powerful regenerative peptides for skin, hair, and overall tissue health. GHK Cu supports collagen production, healing, and visible rejuvenation from within. It's commonly used to improve skin