GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? 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 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum GHK Cu Copper Peptide Shampoo Ion Peptide