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Could iron pills make vaccines work better?

NCT ID NCT05919472

Knowledge-focused Sponsor: Nicole Stoffel 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looked at whether giving oral iron supplements to iron-deficient women in Kenya before or at the same time as vaccination improves their immune response. 180 women received iron either before or with three vaccines (COVID-19, meningitis, and typhoid), or a placebo. The goal was to see if iron timing affects antibody levels. Results are not yet available, but the study aims to find a simple way to help vaccines work better in undernourished populations.

What this could mean

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

Active substance
oral iron supplements (ferrous sulfate)
What this could lead to
If it works, this could point toward a simple way to improve vaccine effectiveness in iron-deficient populations.
What could go wrong
This is a small, completed study focused on immune markers, not disease prevention. Results may not apply broadly or lead to immediate changes in practice.

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

180 people

The number who actually took part.

Started

Jul 2023

Finished

Jul 2024

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 49 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: * Willing and able to give informed consent for participation in the trial * Female aged 18-49 years * Moderate anemia (Hb \<110 g/L, but not severely anemic with Hb \<80 g/L) • Iron deficient (ZnPP \>40 mmol/mol haem) * Anticipated residence in the study area for the study duration Exclusion Criteria: * Major chronic infectious disease (e.g., HIV infection); * Major chronic non-infectious disease (e.g., Type 2 diabetes, cancer); * Chronic medications; * Use of iron-containing mineral and vitamin supplementation 2 weeks prior to study start; * COVID-19 vaccine or confirmed COVID-19 infection within the past 2 years * MenACWY vaccine in the past * Typhoid vaccine in the past * Pregnant (confirmed by rapid test during screening) or lactating. * Malaria (confirmed by rapid test) à study start will be postponed

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Conditions

The condition(s) this trial relates to.

anemia Iron Deficiencies iron deficiency anemia

As listed by the trial registrant

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

Iron deficiency anemia

Contacts and locations

Locations

  • Msambweni County Referral Hospital

    Msambweni, 80404, Kenya

More trials for these conditions

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