N-acetylcysteine (NAC), a glutathione (GSH) synthesis precursor, is thought to have anti-glutamatergic properties for which direct in vivo evidence is lacking. In this study, the postulated anti-glutamatergic properties of NAC were investigated by using 1H MRS to monitor changes in brain levels of both GSH and glutamate (Glu) in response to 4 weeks of NAC supplementation in patients with chronic fatigue syndrome (CFS) and healthy volunteers (HV). Following NAC treatment, GSH levels increased significantly in CFS and numerically in HV, while Glu decreased significantly in both groups compared to baseline – a finding that supports NAC as an anti-glutamatergic agent.
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