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 10% GHK Cu & 5% AHK Cu Hairgenetix Peptides are small chains of amino acids that have been widely studied for their role in supporting hair growth and thickness. Certain peptides are known to help support hair growth pathways, improve AHK CU Peptide Nationwide Peptides by National Science Labs, LLC