Intranasal Insulin for Posttraumatic Stress Disorder

Who May Qualify: - Male or female, 21-65 years old - Current PTSD - Able to provide written willing to sign a consent form Who Should NOT Join This Trial: - Unstable medical condition, clinically determined by a physician - Diabetes requiring insulin or oral hypoglycemic agents - Moderate-severe traumatic brain injury - Current psychotic disorder, bipolar disorder, cognitive disorder in the past 12 months - Current substance use disorders (except alcohol, tobacco, or cannabis) in the past 3 months - Changes in doses of psychotropic medications in the past 4 weeks - Initiation of individual therapy or counseling in the past 4 weeks - Imminent suicidal or homicidal risk - Contraindication to Insulin - History of claustrophobia - Presence of cardiac pacemaker or other electronic device or ferromagnetic metal foreign bodies in vulnerable positions as assessed by a standard pre-MRI safety screening questionnaire Always talk to your doctor about whether this trial is right for you.