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Papaya, carrot, tomato showdown: which fruit delivers more nutrients?

NCT ID NCT01748916

Knowledge-focused Sponsor: Ohio State University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study looked at whether papaya is a better source of carotenoids (nutrients that give fruits and vegetables their color) than carrots or tomatoes. Sixteen healthy adults ate meals containing one of these foods, and researchers measured how much of the nutrients got into their blood. The goal was to see which food helps the body absorb more carotenoids.

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

16 people

The number who actually took part.

Start date

Jun 2011

Finished

Nov 2011

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 70 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 individuals Exclusion Criteria: * lactating, pregnant, or planned to be pregnant * smokers/those who use tobacco products * metabolic or malabsorption disorders * had a history of cancer * history of liver insufficiency or other gastro-intestinal diseases * allergy to papaya, carrots or tomatoes * obesity

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As listed by the trial registrant

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

Focus of study: carotenoid absorption

Contacts and locations

Locations

  • The Ohio State University

    Columbus, Ohio, 43210, United States

  • University of Costa Rica

    San José, Costa Rica