GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect Small molecules. Powerful results. Experience Peptide Power with Hairgenetix's advanced Copper Peptide Hair Growth Serum, formulated with 10% GHK Cu and 5% AHK Cu to support hair health at the follicle level. Helps Neurogan + Health GHK CU Copper Peptide Hair and Scalp Serum PrettyStick Amazon.com: Neurogan GHK Cu Copper Peptide Hair & Scalp Serum 2400mg, 4% Copper Peptides Fast Absorbing, Water Based Formula for Hair Softness & Shine Cosmetic Dry Scalp Moisturizer Spray, Made in USA : GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml) GHK Cu Copper Peptide Therapy for Hair & Skin in Mumbai