Shed Copper Peptide Hair Growth Serum Take an Rx approach to hair health Topical or SubQ GHK Cu? Same molecule. Very different purposes. Topical you apply it on your skin. Think of it as feeding your skin from the outside. In a 12 week study of Hair Growth Serum Intense with Copper Peptide GHK Cu Before and after begins with consistency. Our 10% GHK Cu formula is engineered for deep absorption to support scalp health and visible density. Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum GHK Cu Hair Growth Serum Proven Copper Peptide, $299