CompletedNot Applicable

Probiotic on Psychological and Cognitive Effects

United States200 participantsStarted 2017-02-01

Plain-language summary

This study will determine whether supplementation of probiotic Lactobacillus Rhamnosus GG improves psychological status in middle age and older adults through a 12-week, randomized, double-blind, placebo-controlled clinical trial. Secondary analyses will be conducted to examine the possible benefits of probiotic supplementation on cognitive function and markers of physical health.

Who can participate

Age range

55 Years – 75 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

Inclusion Criteria: * Age 55-75 years * Able to speak and read English Exclusion Criteria: * History of neurological, developmental, or severe psychiatric disorder (e.g. dementia, stroke, schizophrenia); * Antibiotic use in the past 30 days; * History of significant stomach or GI surgery (e.g. gastric bypass, cholecystectomy); * History of alcohol or illicit drug dependence; * History of severe heart, kidney, or liver problems (e.g. heart failure, liver failure); * Regular use of an acid-blocking medication in the past 30 days (i.e. proton pump inhibitor, H2 blocker); * Likely immunosuppression (e.g. chemotherapy treatment); * Regular use of other pre- or probiotic supplements in the past 30 days; * Severe gastrointestinal conditions including celiac disease, Crohn's disease, or diverticulitis.

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.