COPPER PEPTIDES FOR HAIR GROWTH Ultrastrong 10% GHK Cu Formula with Sonora Supply Co. GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml) 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 African Goddess Peptide Revival Serum with GHK Cu Copper Peptide, Fo T Elite Hair Care USA 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care