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Could probiotics boost sperm quality? new trial aims to find out

NCT ID NCT07345455

Disease control Sponsor: Mackay Memorial Hospital 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study tests whether taking probiotics daily for about 100 days can improve sperm count, movement, and shape in men with infertility. Sixty men aged 20 to 45 will be randomly assigned to receive either probiotics or a placebo. Researchers will measure sperm quality at the start, at 60 days, and at the end of the study using advanced lab tests.

What this could mean

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

Active substance
Probiotics (dietary supplement)
What this could lead to
If it works, this could point toward a simple, non-invasive supplement to improve sperm quality in some men with infertility.
What could go wrong
This is a small pilot study with only 60 participants. Probiotics may not improve sperm quality, and results may not apply to all infertility cases.

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

Sep 2023

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

20 to 45 years

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: * Males aged 20 to 45 years * Diagnosis of unexplained oligozoospermia, asthenozoospermia, or oligoasthenoteratozoospermia * Sperm concentration \< 5 x 10\^6/mL * Sperm total motility \< 40% * Sperm morphology (Kruger strict criteria) \< 4% Exclusion Criteria: * History of hormonal disorders or epididymo-orchitis * Substance abuse, including drugs or excessive alcohol consumption * Diabetes mellitus * Kidney disease (defined as a doubling of creatinine levels or more) * Chronic liver disease * Varicocele * Current use of medications that interfere with hormones * Occupational or environmental exposure to pesticides, heavy metals, or solvents * Intake of antioxidant supplements within the past three months * Body Mass Index (BMI) of 30 kg/m\^2 or higher

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Conditions

The condition(s) this trial relates to.

Asthenozoospermia male infertility oligoasthenoteratozoospermia oligospermia Teratozoospermia

As listed by the trial registrant

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

Asthenozoospermia Male infertility Oligoasthenoteratozoospermia Oligozoospermia Teratozoospermia

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

  • MacKay Memorial Hospital

    RECRUITING

    New Taipei City, 25160, Taiwan

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