Where science meets stronger hair. A lightweight serum powered by 10% GHK Cu & 5% AHK Cu, designed for visibly thicker roots and a resilient scalp barrier. Fuller, healthier looking hair begins here. [ AHK Cu Copper Peptide Hair Growth Study (2007) Plain Language Summary Hairgenetix Vitamin B12 injections deliver high doses of this essential vitamin directly into your bloodstream for better absorption than oral supplements to boost energy, support red blood cell production and maintain nerve function. Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz Copper Peptide Hair Growth Treatment GHK cu, AHK cu, Licorice Root Extract, Ginseng Root Extact