N Acetylcysteine Antioxidants Tocris Bioscience 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 NAC Supplements N Acetylcysteine 600 mg & 1000 mg Options Vitabright NAC Supplement 600mg x180 Capsules Pure NAC Acetylcysteine for Glutathione Detox Post Workout Gym Supplements 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 the beginning. Consistency is