PDF) The effect of tripeptide copper complex on human hair growth in vitro Copper Peptide Hair Regrowth Formula GHK CU AHK CU: Real Results for Thinning Hair in Men and Women Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care Copper peptides (GHK Cu) have been studied for decades for their role in tissue repair and that same biology applies to hair. Research shows GHK Cu may help strengthen existing hair follicles, reduce