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 GlucoPro Max for Healthy Glucose Support Vitabright NAC Supplement 600mg x180 Capsules Pure NAC Acetylcysteine for Glutathione Detox Post Workout Gym Supplements