Mayraki Hair Growth Serum Intense with Copper Peptide GHK Cu Hair Growth Serum for Woman and Man, Hair Growth Oil, Hair Regrowth Treatment, Hair Before and after begins with consistency. Our 10% GHK Cu formula is engineered for deep absorption to support scalp health and visible density. GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Does GHK Cu Regrow Hair? Here's What the Research Shows So excited about this peptide! GHK Cu serum and scalp solution available Fascinating peptide that helps to prevent and reduce fine lines and wrinkles. Applied topically on the scalp for hair growth.