Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz AHK CU Peptide Nationwide Peptides by National Science Labs, LLC GHK Cu for hair growth does it actually work? Short answer: no. GHK Cu can be great for skin but when it comes to hair growth, the evidence just isn't there. And this Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum AHK CU Dosage Guide: How Much to Use Daily Neurogan Health