I just finished ranking and reviewing popular peptide facial serumsfrom not a fan to the truly best optionbased on ingredient safety, transparency, and how well they support your skin without unnecessary additives. 2 weeks in on GHK Cu and the glow is REAL. Brighter complexion More even skin tone Less breakouts Softer fine lines Thicker, fuller hair This is just 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 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 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 N Acetyl Cysteine (NAC) + Glycine 800mg 60 Caps