More than hair its cellular support , GHK CU is a well studied copper peptide known for its role in supporting:, Healthier looking hair & scalp environment, Hair that appears thicker, Hair Growth Serum Intense with Copper Peptide GHK Cu AHK Cu Copper Peptide Hair Growth Study (2007) Plain Language Summary Hairgenetix Hair Growth Serum Intense with Copper Peptide GHK Cu 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 PDF) The effect of tripeptide copper complex on human hair growth in vitro