Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz AHK Cu + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan Neurogan Health Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz 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