AHK CU Peptide Nationwide Peptides by National Science Labs, LLC 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 Advanced GHK CU + AHK CU Peptide Hair Growth Serum 30ml Azur Skin 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 Set Complete Hair Growth Treatment (Shampoo, Conditioner & Serum)