GHK Cu Copper Peptide Hair & Scalp Serum GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect 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 Peptide Labz Copper Peptide Hair Growth Serum, 10% GHK cu, 5% AHK cu, Rejuvenates Follicles Walmart.com GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health