Effect of L-theanine on depressive symptoms

Effect of L-theanine on depressive symptoms - Effect of L-theanine on depressive symptoms

Status

Active, not recruiting

Phases

Phase 2

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000014653

Enrollment

Registered

2014-08-01

Start date

2014-10-15

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

mood disorder

Interventions

L-theanine 250mg/day once a day for 2 months.

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Subjects were patients with major or minor depressive disorder according to the DSM-IV criteria.

Exclusion criteria

Exclusion criteria: Participants were excluded if they had a prior medical history of central nervous system disease or severe head injury, or if they met the criteria for substance abuse or dependence. 20

Design outcomes

Primary

Measure	Time frame
The severity change of depressive symptoms.	—

Secondary

Measure	Time frame
The change of cognition.	—

Countries

Japan

Contacts

Public ContactMiho Ota

National Center of Neurology and Psychiatry Department of Mental Disorder Research, National Institute of Neuroscience

ota@ncnp.go.p0423412712

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026