GWICTIC: NAC Mechanistic Study in Gulf War Veterans

This study is looking at how a supplement called NAC (N-acetylcysteine) affects the brain and body in veterans who have Gulf War Illness — a condition that causes chronic fatigue, pain, and thinking problems in people who served in the 1990-1991 Gulf War. Researchers want to understand the biological mechanisms behind the illness and whether NAC might help. You may be eligible if: - You are between 47 and 70 years old - You served in the Gulf War Theater between August 1990 and July 1991 - You have been diagnosed with Gulf War Illness under the Kansas definition - You are willing to attend follow-up visits You may NOT be eligible if: - You have active major depression with psychotic features, schizophrenia, bipolar disorder, dementia, or drug/alcohol abuse - You have severe claustrophobia or difficulty with MRI scanning - You have active HIV, Hepatitis B, or Hepatitis C - You have significant kidney or liver disease - You have uncontrolled diabetes - You are pregnant - You are currently on dialysis or taking certain antiviral medications Talk to your doctor to see if this trial is right for you.