If you don't know you should ask somebody. GHK Cu (copper peptide) is a potent, naturally occurring regenerative compound that reverses skin aging, accelerates wound healing, reduces inflammation, and promotes hair growth. It Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience Glow Up Patches, for glowing skin & hair growth Hapi Patch HapiPatch L Glutathione (Reduced), 500 mg, 30 Veggie Capsules GHK Cu Peptide Therapy in Brentwood TN Relive Health Best Glutathione Supplement Brand in India Glutone