2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care 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 Amazon.com: Copper Peptide Hair Serum with Copper Tripeptide 1 Dual Peptide Scalp Treatment plus Licorice Root Extract : Beauty & Personal Care Set Hairgenetix Set Copper Peptide Serum for Hair Regrowth & Thinning Hair Feline Skinscience