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Women's protein needs may change with their cycle, tiny study suggests

NCT ID NCT06533501

Knowledge-focused Sponsor: University of British Columbia Source: ClinicalTrials.gov ↗

What the study statuses mean

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 the amount of leucine (a key protein building block) women need changes during different phases of the menstrual cycle. Thirteen women with regular cycles ate controlled meals and gave breath and urine samples. The goal is to see if current one-size-fits-all protein guidelines for women need updating.

What this could mean

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

Active substance
dietary leucine
What this could lead to
If successful, this could help set more accurate dietary protein recommendations for women, tailored to their menstrual cycle.
What could go wrong
This is a very small, early-stage study (13 participants) that only measures a metabolic marker, not health outcomes. Results may not apply to all women.

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

13 people

The number who actually took part.

Started

Mar 2024

Finished

Jun 2025

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 35 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: * People with menstrual cycles * Between the ages of 20 to 35y * Regular menstrual cycle (21-35 day cycle) for the past 12 months * Body mass index (BMI) of between 18 and 28 kg/m2 * Free from pre-existing health conditions Exclusion Criteria: * People who are currently using hormonal birth control or any contraceptive that would affect sex hormones * People on hormone therapy * People with an abnormal menstrual cycle history * People with non-traditional dietary practices * Recent weight loss/weight gain * People with a history of endocrine disorders * People who are pregnant * People who are breastfeeding * People who have given birth in the last 18 months * People who depend on medication that affects normal metabolism. Any medication that alters normal body metabolism would skew the results and compromise the validity of the data set. * People with a metabolic, neurological, genetic, or immune disorder likely to affect nutritional requirements or overall body metabolism.

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As listed by the trial registrant

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

Menstrual cycle

Contacts and locations

Locations

  • BC Children's Hospital Research Institute

    Vancouver, British Columbia, V5Z 4H4, Canada

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