Amazon.com: Asterwood Copper Peptides Serum for Face with GHK Cu Peptide and Hyaluronic Acid Anti Aging Facial Serum 1 Fl Oz : Beauty & Personal Care Amazon.com: DEAL SUPPLEMENT NAC Supplement (N Acetyl Cysteine) 1,000mg Per Serving with Reduced Glutathione, 240 Capsules Antioxidant Support for Immune Health, Lung, & Liver Function : Health & Household Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb Active just means the serum contains a functional, lab verified concentration of real GHK Cu copper peptide not just colour or trace copper. Our formula includes 300mg of pure GHK Cu (1% concentration) in Skin Biology Super GHK Copper Serum VS Asterwood Naturals Copper