MRS Measurement of Glutamate and GABA Metabolism in Brain
Run by National Institutes of Health Clinical Center (CC) · NCT00109174 · Data updated 2026-11-12
This study is testing how levels of two important brain chemicals, glutamate and GABA, change in people to better understand their role in brain health.
Quick facts
| Study type | Interventional |
|---|---|
| Ages | 18 Years to 65 Years |
| Sex | All |
| Enrollment | 200 (estimated) |
| Sponsor | National Institutes of Health Clinical Center (CC) NIH |
| Locations | 1 site (Bethesda, Maryland) |
| Status | Recruiting |
| Started | September 6, 2006 |
| Main results expected | January 11, 2030 |
| Study ends | March 11, 2030 |
| Registry record updated | October 29, 2026 |
| Trial ID | NCT00109174 on ClinicalTrials.gov |
Is this trial a fit for you?
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A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
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Why it matters
Potential benefit: Unknown
How similar studies have gone: Unknown
Who can join: the full rules
Show full inclusion / exclusion criteria
* INCLUSION CRITERIA: * 18-65 years of age * Able to give written informed consent * Healthy based on medical history and physical exam * Enrolled in Protocol 01-M-0254 or Protocol 17-M-0181 EXCLUSION CRITERIA: * Any current Axis 1 diagnosis * Clinically significant laboratory abnormalities * Positive HIV test * Metallic foreign bodies that would be affected by the magnetic resonance imaging (MRI) magnet, or fear of enclosed spaces likely to make the subject unable to undergo an MRI scan. * History of neurological illness or injury with the potential to affect study data interpretation, such as multiple sclerosis, Parkinson s disease, seizure disorder or traumatic brain injury * Prescription psychotropic medication, drug free less than 8 weeks (anticholinergics, benzodiazepine, fluoxetine, antipsychotics, and anticonvulsants) * Serious medical illness as determined from H\&P or laboratory testing including Diabetes * Inability to lie flat on camera bed for about two and a half hours * Pregnant or breastfeeding * Current substance use disorder based on DSM-5 * NIMH employees and staff and their immediate family members will be excluded from the study per NIMH policy.
Where it's running
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National Institutes of Health Clinical Center
Bethesda, Maryland, United States Recruiting
Study contacts
- Principal investigator: Li An, Ph.D. — National Institute of Mental Health (NIMH)
- Study coordinator: Christopher S Johnson
- Email: johnsonchri@mail.nih.gov
- Phone: (301) 402-6695
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.