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Many peptides exist naturally in the body, including GHk-Cu, copper peptides

10.1152/japplphysiol.00372.2013 117 XuK

doi: 10.1093/annonc/mdr461 9 FoulkesWDSmithIEReis-FilhoJS

At very high doses, NAC can help, but it has to be turned into active glutathione, and this system is impaired in older adults and in many chronic illnesses
