Studies related to Insomnia and Theanine

L-theanine In The Adjunctive Treatment Of Generalized Anxiety Disorder: A Double-blind, Randomised, Placebo-controlled Trial

Effect Decrease
Values Insomnia Severity Index. Mean and SD. Placebo: before 10.9 (7.12), after 10.6 (7.66, 13.5). Theanine: before 11.7 (6.05), after 9.72 (6.79, 12.6).
Trial Design Randomized trial
Trial Length 1-6 months
Number of Subjects 46
Sex Both Genders
Age Range 18-29, 30-44, 45-64, 65+
Notes for this study:
In a randomized, double-blind, placebo-controlled trial 46 participants with generalized anxiety disorder were allocated to take 450 mg of theanine (in two divided doses of the course of the day, or placebo for 8 weeks.

The primary outcomes were anxiety and insomnia. There were no statistically significant or notable differences between groups for anxiety outcomes. There was a small advantage of theanine for insomnia, but the difference wasn't statistically significant. Additionally, the change in depression rating wasn't notably different.
Funding issues for this study:
"JS is supported by an NHMRC Clinical Research Fellowship (APP
1125000). The study was co-sponsored by FIT-BioCeuticals. No funding
source was involved in the design, statistical analysis or preparation of
this manuscript. Study sponsors similarly played no role in the decision
to submit this manuscript for publication."