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 Glutathione Sync 600 mg Capsules Immune System & Lung Health L Glutathione Astaxanthin N Acetyl L Cysteine ALA Vitamin C E Tablets, For Clinical, Packaging Type: Box at 1190 box in Nagpur MAXIMUM POTENCY 600mg NAC Capsules (N Acetyl L Cysteine) Supplement Powerful Antioxidant Glutathione Support Liver Support Vegan Gluten Free. 90 Easy to Swallow Capsules. 3 Packs 270 count (Pack of 1) Buy Now with GHK Cu 50mg Spartan BioLabs N acetylcysteine (NAC) is a supplement I frequently recommend to clients most commonly for conditions such as endometriosis or as part of post concussion protocols. Some of you might also recognise NAC