NIPH Clinical Trials Search

JRCT ID: jRCTs041200036

Registered date:21/07/2020

Yam extract study for dementia

Basic Information

Recruitment status Complete
Health condition(s) or Problem(s) studiedMild cognitive impairment and mild Alzheimer's d isease
Date of first enrollment16/12/2020
Target sample size50
Countries of recruitment
Study typeInterventional
Intervention(s)Intake of Yam extract


Primary Outcome1) MMSE 2) ADAS-cog
Secondary Outcome1) Level of NF-L in plasma 2) Level of Abeta42 and Abeta40 in plasma for Abeta42/40 ratio 3) Level of GFAP in plasma

Key inclusion & exclusion criteria

Age minimum>= 40age old
Age maximum<= 85age old
Include criteria1) Those whose age at consent date is 40 years - 85 years. 2) Those who can participate in the inspection performed at the University of Toyama Sugitani campus. 3) Those who meet the criteria for mild cog nitive impairment or mild Alzheimer's disease according to DSM-5. For patients with mild Alzheimer's disease, those who are taking only cholinesterase inhibitors. 4) Those who have MMSE score of 20 or more at the time of screening . 5) Those who ag ree to provide blood samples for clinical tests. 6) The person can take the test drug , and the person or family can manag e the medication of the test drug. 7) Those who agree not to take commercially available yam extract products during the test period. 8) Those who ag ree not to make any extreme chang es in lifestyle habits such as exercise and eating habits during the test period.
Exclude criteria1) Patients in the neurodevelopmental disorder, schizophrenia spectrum disorder and other psychotic disorders, bipolar disorder and related disorders, eating behavior disorder and eating disorder, personality disorder group. 2) Those who was in uncontrolled and clinically problematic health conditions (diabetes, hypertension, thyroid / endocrine disorders, cong estive heart failure, angina, heart disease, cancer risk such as breast cancer, uterine cancer, or ovarian cancer, gastrointestinal disease, dialysis or renal dysfunction, etc.) within 3 months of consent. 3) Those who have a history of alcohol and substance abuse 4) Those who have a history of yam allergy 5) Those who are participating in other invention clinical trials 6) Any other person who is judged to be inappropriate as a subject by the researcher

Related Information


Public contact
Name Chihiro Tohda
Address 2630 Sugitani, Toyama Toyama Japan 930-0194
Telephone +81-76-434-7646
Affiliation University of Toyama
Scientific contact
Name Michio Suzuki
Address 2630 Sugitani, Toyama Toyama Japan 930-0194
Telephone +81-76-434-7320
Affiliation Toyama University Hospital