GHK Cu for Hair Growth? It Works But Only If You Do It Right. Everyones talking about GHK Cu, but heres the catch most serums never make it past your scalp barrier. If the formulas too weak, it Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz Two Ingredients. Real Hair Transformations. How Neurogan Health's GHK Cu Serum Is Changing What Customers Expect From Hair Care Glow from within with GHK Cu Copper Peptide , This powerhouse peptide supports collagen production, skin repair, and hair follicle health, helping improve skin firmness, radiance, and support