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Sauerkraut and kimchi: a surprising remedy for long COVID?

NCT ID NCT06560554

Symptom relief Sponsor: Mayo Clinic Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only This study
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This Mayo Clinic study is testing whether eating fermented foods like yogurt, kimchi, and sauerkraut can improve gut microbiome diversity in people with long COVID. Forty adults with long COVID symptoms will either add fermented foods to their diet or continue as usual. Researchers will track changes in gut bacteria and symptoms like fatigue and anxiety over 12 weeks.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
fermented foods (probiotic-rich diet)
What this could lead to
If it works, this could point toward a simple dietary approach to improve gut health and reduce long COVID symptoms like fatigue and brain fog.
What could go wrong
This is a small, early-stage study with only 40 participants, so results may not apply to everyone. The diet requires eating up to 6 servings of fermented foods daily, which may be hard to maintain.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 40 people

The number the study aims to enrol. It can still change while the study runs.

Started

Sep 2024

Expected to finish

Dec 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Adult (\> 18 years old) 2. Patients who have long COVID symptoms a. Long COVID will be defined as: i. A previously documented COVID + infection within the last year ii. A presence of neurological symptoms that started within 4 weeks of the COVID infection (fatigue, difficulty concentrating, depression, anxiety) as per CDC definition of Long Covid. 3. Own a smart device capable of downloading a food logging application. Able to understand and document informed consent 4. Seen in the Mayo Clinic long-COVID Clinic within the Department of General Internal Medicine Exclusion Criteria: 1. History of dementia, moderate or severe cognitive dysfunction, developmental delay, psychotic disorders such as schizophrenia 2. Unable to tolerate oral foods 3. Potential contraindications to a fermented food diet (chronically immunosuppressed including organ transplant recipients) 4. Neutropenic as listed in the "active problems" list in the EMR 5. Undergoing chemotherapy at the time of consent 6. Taking MAOIs at the time of consent. 7. Active uncontrolled inflammatory bowel disease including ulcerative colitis, Crohn's disease, indeterminate colitis, irritable bowel syndrome (moderate or severe), infectious gastroenteritis, colitis or gastritis, Clostridium difficile infection (recurrent), malabsorptive diseases (such as Celiac disease), major surgery of the GI tract with the exception of cholecystectomy and/or appendectomy in the past 5 years, or any major bowel resection at any time. 8. A reported consumption of 2 servings of probiotic fermented food per day in their normal baseline diet. 9. Pregnancy

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Conditions

The condition(s) this trial relates to.

anxiety disorder Depression long COVID-19

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Long COVID

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    The full official record for this study. This one lists no contact details, but it is the first place any would appear.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Mayo Clinic

    Rochester, Minnesota, 55904, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.