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Rainbow carrot juice: a new weapon against diabetes?

NCT ID NCT05319548

Knowledge-focused Sponsor: University of Wisconsin, Madison 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
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 24, 2026 · Last updated Jun 27, 2026 · Updated 2 times

Summary

This study looked at how pigments in different colored carrots (red, purple-red, and purple) affect the body's absorption of vitamin A and other nutrients. Twelve healthy adults drank each type of carrot juice over several weeks, and researchers measured changes in their blood. The goal was to see if combining certain pigments could boost health benefits, like antioxidant activity and blood sugar control.

What this could mean

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

Active substance
Carrot juice (red, purple-red, or purple)
What this could lead to
If successful, this could help design foods that maximize the health benefits of plant pigments, potentially aiding diabetes prevention.
What could go wrong
This is a small, early-stage study with only 12 healthy participants, so results may not apply to the general population or those with health conditions.

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

12 people

The number who actually took part.

Started

Oct 2022

Finished

May 2023

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 to 40 years

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 * Non-smoking * Not pregnant (or planning to become pregnant) * Body Mass Index (BMI) greater than 18.5 and less than 30 Exclusion Criteria: * Major comorbidities (cardiovascular disease (CVD), diabetes, cancer, kidney/liver/bowel disease) * History of malabsorptive/GI disorders * Abnormal diet * BMI less than 18.5 or greater than 30 * Food intolerances/allergies/hypersensitivities * History of substance abuse or alcoholism * Unwilling to restrict consumption of specific foods prior to study * Unwilling to participate in blood draws * History of difficulty drawing blood/health issues associated with blood draws (gets dizzy, etc).

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As listed by the trial registrant

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

Healthy

Contacts and locations

Locations

  • UW-Madison Department of Nutritional Sciences

    Madison, Wisconsin, 53706, United States

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