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A handful of pecans a day: Nature's sun shield?

NCT ID NCT06879626

Prevention Sponsor: University of California, Los Angeles 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jul 31, 2026 · Last updated Jul 31, 2026

Summary

This study tests whether eating 2 ounces of pecans every day for 12 weeks can help the body resist oxidative damage from UV light, compared to eating pretzel snacks. Researchers will measure skin's tolerance to UVB exposure, skin hydration, elasticity, and other characteristics, as well as blood markers of aging and gut bacteria. The trial involves generally healthy women aged 55-75 who follow a typical Western diet.

What this could mean

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

Active substance
Pecans (2 oz daily) compared to pretzel snacks (3.5 oz daily)
What this could lead to
If pecans help protect skin from UV damage and improve aging markers, they could become a simple dietary addition to support healthier aging.
What could go wrong
This is a small, early-stage study, and results may not apply to everyone. Eating pecans daily adds calories, and the benefits are not guaranteed.

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 60 people

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

Started

May 2025

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

55 to 75 years

Sex

Female participants only

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: * Female * Generally healthy * Aged 55-75 years * BMI 18.5-34.9 kg/m2 * Fitzpatrick Skin type II-IV * Consume a typical Western diet (low in polyphenols-rich foods and fiber) * Willing to maintain habitual dietary and exercise patterns for the study duration * Willing to maintain normal skin care products and pattern for the duration of the study * Willing to come to study visits without any makeup and skin products on * Subjects must read and sign the Institutional Review Board-approved written informed consent prior to the initiation of any study specific procedures or enrollment. A subject will be excluded for any condition that might compromise the ability to give truly informed consent. Exclusion Criteria: * Vegetarian/vegan * Known nut allergy * Skin-related prescription medication, supplements or non-prescription cosmeceutical agents * Initiation of topical or oral prescription steroids and/or anti-inflammatory medications within 30 days prior to study enrollment * Excessive exposure to either natural or artificial sunlight * Screening laboratory values outside of the normal range that is considered clinically significant for study participation by the investigator * Documented chronic disease * Taking medications or supplements known to affect gut microbiota composition (antibiotics within the past 3 months, probiotics, fiber, etc.) * Taking exogenous hormones (e.g. hormone replacement therapy) * Recent weight fluctuations (\>10% in the last 6 months) * Smoker or living with a smoker * Use of \>20 g of alcohol per day * Unable or unwilling to comply with the study protocol (including unwillingness to avoid nuts for the whole duration of the study) * Unable to provide consent * Pregnancy and/or lactation

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As listed by the trial registrant

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

Aging

Contacts and locations

Locations

  • UCLA Center for Human Nutrition

    Los Angeles, California, 90095, United States

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