A study on stress reduction of students by White Leaf Tea

A study on stress reduction of students by White Leaf Tea - Anti-stress effect of White Leaf Tea

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000031778

Enrollment

Registered

2018-04-23

Start date

2018-04-09

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

Stress

Interventions

White Leaf Tea (3 g) for 15 days Placebo tea (3 g) for 15 days

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Students of pharmaceutical sciences in the 5th grade, non-smoker. Obtained written informed consent from the student before participation. Possible to take White Leaf Tea eluted in 500 mL water for 15 days excluding weekends and holidays. Possible to check salivary amylase activity two times daily for 15 days.

Exclusion criteria

Exclusion criteria: Taking tranquilizer(s) Diagnosed as inadequate to participate in the study by a doctor

Design outcomes

Primary

Measure	Time frame
Alteration in salivary amylase activity in students during daily life at university and during pharmacy practice for 15 days.	—

Secondary

Measure	Time frame
Physical condition, Sleeping time, State-trait anxiety inventory (STAI test), replying to a questionnaire (subjective stress, achievement emotion)	—

Countries

Japan

Contacts

Public ContactKeiko Unno

University of Shizuoka Tea Science Center

unno@u-shizuoka-ken.ac.jp054-264-5822

Outcome results

None listed

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