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Shingles shot may shield brain: 33,000 seniors test dementia link

NCT ID NCT07502560

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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

Summary

This study is testing whether the Shingrix vaccine, already used to prevent shingles, can also lower the risk of dementia in adults aged 76 and older. Over 33,000 participants in Finland will receive either the vaccine or a placebo. Researchers will track new dementia diagnoses over time to see if the vaccine offers added brain protection.

What this could mean

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

Active substance
Shingrix (recombinant zoster vaccine)
What this could lead to
If successful, this could show that the shingles vaccine also helps prevent or delay dementia in older adults.
What could go wrong
This is a large trial, but it's testing a secondary effect—the vaccine may not reduce dementia risk. Results 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

Phase 4

Runs after approval, following long-term safety and how well the treatment works in everyday use.

Participants

About 33,609 people

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

Started

Mar 2026

Expected to finish

Mar 2037

An estimate. End dates often move.

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

76 years and older

Sex

Anyone

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: * Citizens living permanently in Finland, who, in the opinion of the investigator, can and will comply with the requirements of the protocol. * Written or witnessed informed consent obtained from the participant prior to performance of any study-specific procedure. Informed consent will include consent to access health register data for participants. * Age 76 years or older at the time of signing the informed consent. Exclusion Criteria: * Prior receipt of a Herpes Zoster (HZ) vaccine. * History of dementia diagnosis prior to enrolment, including confirmed cases or those under investigation. This includes: * History of a confirmed clinical diagnosis of dementia prior to enrolment. * Prior or current use of medications intended to treat dementia. * Current or recent history of cognitive assessments for any memory deficit or suspected dementia before enrolment including investigations that are ongoing or that were inconclusive (but not those for which dementia was conclusively ruled out); mild cognitive impairment on its own without any other information to indicate cognitive decline or dementia will not result in exclusion. * Severely immunocompromised individuals. * Concurrently participating in another clinical trial, in which the participant has been or will be exposed to an investigational product or ongoing participation in trials focused on preventive dementia interventions. * Known systemic hypersensitivity to any of the vaccine components, or history of a life-threatening reaction to the vaccines used in the study or to a vaccine containing any of the same substances. * Living in a nursing facility.

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Conditions

The condition(s) this trial relates to.

Alzheimer disease herpes zoster dementia prevention target

As listed by the trial registrant

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

Herpes zoster

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    8 sites. 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

  • GSK Investigational Site

    RECRUITING

    Espoo, 02230, Finland

  • GSK Investigational Site

    RECRUITING

    Helsinki, 00100, Finland

  • GSK Investigational Site

    RECRUITING

    Jarvenpaa, 04400, Finland

  • GSK Investigational Site

    RECRUITING

    Kokkola, 67100, Finland

  • GSK Investigational Site

    RECRUITING

    Oulu, 90220, Finland

  • GSK Investigational Site

    RECRUITING

    Seinäjoki, 60100, Finland

  • GSK Investigational Site

    RECRUITING

    Tampere, 33100, Finland

  • GSK Investigational Site

    RECRUITING

    Turku, 20520, Finland

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