BPC 157, TB 500 & GHK Cu Glow Stack Research Peptide Blend PDF) The effect of tripeptide copper complex on human hair growth in vitro 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 GHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair 12 Week Supply (30 mL) Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz