2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care Copper Peptide Hair Growth Treatment GHK cu, AHK cu, Licorice Root Extract, Ginseng Root Extact Hair Growth Serum Intense with Copper Peptide GHK Cu 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 Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience