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Blueberry study: your gut bugs may control how you absorb superfood

NCT ID NCT07607158

Knowledge-focused Sponsor: Colorado State University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 study looks at how differences in people's gut bacteria affect the way their bodies process nutrients from blueberries. Researchers will give 125 healthy adults a single blueberry drink and measure the levels of blueberry compounds in their blood and urine over time. The goal is to see if the unique mix of gut microbes can predict how well someone absorbs these compounds, which may help explain why some people get more health benefits from berries than others.

What this could mean

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

Active substance
Freeze-dried blueberry powder beverage
What this could lead to
If successful, this could help explain why people respond differently to berry nutrients, potentially guiding personalized nutrition advice.
What could go wrong
This is an early observational study, not a treatment trial. It only looks at short-term effects after a single dose, so results may not apply to long-term health or other foods.

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 125 people

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

Started

Jan 2026

Expected to finish

Jan 2028

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: * Healthy adults ≥18 years of age * Able and willing to provide informed consent * Willing and able to adhere to all study procedures and visit requirements Exclusion Criteria: * Age \<18 years * Pregnant or breastfeeding * Presence of chronic diseases, including but not limited to cardiovascular disease, diabetes, cancer, kidney, liver, gastrointestinal, or pancreatic disease * Use of medications for chronic diseases that may interfere with study outcomes * Any condition known to negatively impact nutrient absorption (e.g., inflammatory bowel disease, celiac disease, gastroparesis) * Anemia (hemoglobin \<13.5 g/dL in men or \<12.0 g/dL in women) * Body mass index (BMI) ≤18.5 kg/m² * Use of antibiotics within the past 2 months * Recent blood draw within 1 week prior to study participation * Currently participating in another research study involving a diet or exercise intervention * Known allergy or contraindication to blueberry products or study procedures * Unwilling or unable to comply with study requirements

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Conditions

The condition(s) this trial relates to.

metabolic disease

As listed by the trial registrant

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

Metabolomics Microbiome analysis

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

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    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

  • Colorado State University; Food and Nutrition Clinical Research Laboratory; Gifford Building Room 216; 502 West Lake Street, Fort Collins, CO 80523

    RECRUITING

    Fort Collins, Colorado, 80523, United States

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