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Walnuts may boost sperm quality, study finds

NCT ID NCT01954498

Symptom relief 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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tested whether eating two ounces of walnuts each day could improve sperm count, movement, and shape in men with fertility issues. 80 men took part, comparing walnuts to a standard multivitamin. The goal was to see if a simple diet change could help with natural or assisted conception.

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

80 people

The number who actually took part.

Start date

May 2014

Finished

Mar 2020

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

21 years and older

Sex

Male participants only

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: * Age 21 years or older * Sperm concentration \< or = to 41 million per ml * Sperm motility \< or = to 40% * Normal sperm morphology forms \< or = to 5.5% * Patients of Howard H. Kim, MD seen at the Male Reproductive Medicine and Microsurgery Clinic, Cedars-Sinai Medical Center, Los Angeles, California * Have eaten walnuts throughout life without adverse reaction Exclusion Criteria: * Allergy to walnuts or tree nuts * Food allergy * Known genetic cause of infertility * Known anatomical cause of infertility * History of seizure disorder

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Conditions

The condition(s) this trial relates to.

Asthenozoospermia infertility disorder male infertility oligoasthenoteratozoospermia oligospermia Teratozoospermia

As listed by the trial registrant

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

Asthenozoospermia Fertility Oligozoospermia Teratozoospermia

Contacts and locations

Locations

  • Male Reproductive Medicine and Microsurgery Clinic, Cedars-Sinai Medical Center

    Los Angeles, California, 90048, United States

  • University of California Los Angeles

    Los Angeles, California, 90095, United States

More trials for these conditions

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