Punky this was part of the supplements article I posted but is specific to anxiety...

The amino acid L-theanine reduces state anxiety by increasing alpha activity and stimulating synthesis of γ-aminobutyric acid. Noticeable anxiety reduction is generally achieved within 30 to 40 minutes, and effective dosages range from 200 to 800 mg/d. Preliminary findings suggest that L-theanine may be an effective adjuvant in the management of psychotic disorders. Patients with schizophrenia or schizoaffective disorder were randomized to receive L-theanine or placebo while continuing their antipsychotic medications.21 Patients who received L-theanine experienced moderate reductions in symptoms of psychosis and anxiety, and there were no differences in quality-of-life measures between the groups.

- See more at: Integrative Management of Schizophrenia: Page 3 of 3 | Psychiatric Times