Hair Growth Serum Intense with Copper Peptide GHK Cu GHK Cu peptides are used to potentially promote hair growth, increase hair follicle size, and improve scalp health, often for conditions like androgenetic alopecia. As a regenerative peptide, GHK Cu is believed to 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care Seraphime AHK Cu + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan Neurogan Health