When your hair feels stronger, you do too. The Hairgenetix Extra Strength Copper Peptide Serum, formulated with 10% GHK Cu and 5% AHK Cu, supports hair health at the root helping strengthen follicles, 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care Seraphime GHK CU: Promote Hair Growth & Thicker Follicles Evolve GHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair 12 Week Supply (30 mL)