Effect of L-serin ingestion on circadian photoentrainment -a randomized, double-blind, and placebo-controlled study-

Effect of L-serin ingestion on circadian photoentrainment -a randomized, double-blind, and placebo-controlled study- - Effect of L-serin ingestion on circadian photoentrainment

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000027505

Enrollment

Registered

2017-05-26

Start date

2014-05-01

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

Healthy volunteer

Interventions

Single ingestion of L-serin 30 minutes before bed time Single ingestion of placebo 30 minutes before bed time

Eligibility

Sex/Gender

Male

Inclusion criteria

Inclusion criteria: Male univercity students or graduate students

Exclusion criteria

Exclusion criteria: 1)Subjects who take hyponotics and sedatives 2)Subjects who are shift worker or night worker 3)Subjects whose DLMO was not detected by screening test

Design outcomes

Primary

Measure	Time frame
Dim Light Melatonin Onset (DLMO)	—

Secondary

Measure	Time frame
Psychomotor Vigilance Task (PVT) Karolinska. Sleepiness Scale (KSS)	—

Countries

Japan

Contacts

Public ContactSang-il Lee

Kyushu University Department of Human Science

sangil98@gmail.com092-553-4523

Outcome results

None listed

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