Effects of the extract of Dioscorea batatas on cognitive functions in healthy adults

Effects of the extract of Dioscorea batatas on cognitive functions in healthy adults - Effects of the extract of Dioscorea batatas on cognitive functions in healthy adults

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000021151

Enrollment

Registered

2016-02-28

Start date

2016-03-01

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 adults

Interventions

Treatment A - wash out - Treatment B Tretament A: Intake of capsules containing the extract of Dioscorea batatas. 25 mg extract/capsule (= 4 mg diosgenin/capsule), two capsules per day, for 3 months

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Healthy human psychologically and physically living in Toyama prefecture, who volunteers to attend this clinical study. Subjects have no food allergy against Dioscorea rhizome (Yam).

Exclusion criteria

Exclusion criteria: Subjects who have visited the hospital due to forgetfulness or memory dysfunction. Subjects who have food allergy against Dioscorea rhizome (Yam).

Design outcomes

Primary

Measure	Time frame
At pre and post (for 3 months) administration of the extract of Dioscorea batatas, these tests of cognitive functions are done; Mini Mental State Examination (MMSE)and Repeatable Battery for the Assessment(RBANS)	—

Secondary

Measure	Time frame
analysis of the blood	—

Countries

Japan

Contacts

Public ContactChihiro Tohda

University of Toyama Division of Neuromedical Science, Institute of Natural Medicine

chihiro@inm.u-toyama.ac.jp076-434-7646

Outcome results

None listed

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