AHK Cu Copper Peptide Hair Growth Study (2007) Plain Language Summary Hairgenetix Copper Peptide GHK Cu Copper Peptide GHK Cu (Copper Peptide) has emerged as one of the most promising regenerative peptides for hair restoration due to its ability to stimulate follicular activity, improve scalp circulation, reduce inflammation, and prolong the Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3 Dr. Brenner Labs