Not all hair serums are built the same This one is powered by a dual copper peptide system GHK Cu + AHK Cu Designed to support: stronger feeling hair improved elasticity Neurogan + Health GHK CU Copper Peptide Hair and Scalp Serum PrettyStick Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz Amazon.com: Neurogan GHK Cu + AHK Cu Hair Serum Pro Lightweight Scalp Serum with Dual Copper Peptides Daily Hair & Scalp Use, Cosmetic Product : Beauty & Personal Care Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz