Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum 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 AHK CU + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan Copper Peptide Hair Growth Serum 10% GHK Cu & 5% AHK Cu Hairgenetix GHK Cu Hair Foam for Men Cosmetic Scalp Support & Hair Appearance Eden