GHK Cu 50mg Particle Peptides Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care Latanoprost and Copper Peptides for Hair Growth, When we talk about topical hair growth support, two ingredients that I find interesting are latanoprost and copper peptides., Latanoprost is a Copper Peptide Hair Growth Serum (GHK Cu & AHK Cu)