RecruitingEarly Phase 1Drug trialGWICTIC: NAC Mechanistic Study in Gulf War VeteransThis mechanistic study will test if NAC affects chronic oxidative stress and depletion of antioxidants in GWI participants. Blood specimen collection and neuroimaging will be used to determine whether NAC affects serum glutathione (GSH) concentration and oxidative stress in the CNS when compared to placebo.