Does it work? Maneup GHK Cu hair growth serum : r tressless Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience Microneedling for Hair Growth: GHK CU Benefits 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