Peptide Labz Copper Peptide Hair Growth Serum, 10% GHK cu, 5% AHK cu, Rejuvenates Follicles Walmart.com GHK Cu (Copper Peptide) is a naturally occurring peptide in the body that binds with copper to support cell repair and renewal. As we age, our levels decrease and thats where supplementation or AHK CU + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan GHK Cu for Hair: Can It Stimulate Follicles & Help Hair Growth? GHK Cu Peptide: Turn Back the Clock Naturally Calibrate Hydration