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Could cheap supplements cut heart failure risks? large trial launches

NCT ID NCT06694727

Disease control Sponsor: Tor Biering-Sørensen 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

Heart failure is a serious condition with a poor outlook despite modern treatments. This large Danish trial will test whether two common supplements—coenzyme Q10 and selenium—can help. About 4,044 adults with heart failure will take either the supplements or placebos for 2-3 years. Researchers will track how many are hospitalized for heart failure or die from heart problems.

What this could mean

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

Active substance
coenzyme Q10 and selenium supplements
What this could lead to
If it works, this could offer a simple, safe, and cheap way to lower the risk of heart failure complications like hospital stays or death.
What could go wrong
This is a large trial, but earlier smaller studies may not hold up. Supplements might not provide significant benefit over standard care, and results could take years to confirm.

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 3

Large-scale testing in a bigger group. Usually the last step before a treatment can be approved.

Participants

About 4,044 people

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

Started

Sep 2025

Expected to finish

Jun 2029

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

18 years and older

Sex

Anyone

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: * Individuals aged ≥ 18 years. * Registered with a heart failure diagnosis (ICD-10: I50) as a primary discharge diagnosis in The Danish National Patient Registry and at least one claimed prescription of a renin-angiotensin-system inhibitor and a β-blocker within 120 days after HF diagnosis. * Informed consent form has been signed and dated. Exclusion Criteria: * Use of vitamin K-antagonist * Registered with a cancer diagnosis (C00-C97 not C44) within the last 5 years excluding cutaneous squamous cell or basal cell carcinoma in The Danish National Patient Registry.

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Conditions

The condition(s) this trial relates to.

heart failure

As listed by the trial registrant

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

Heart failure

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

  • Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte

    RECRUITING

    Hellerup, 2900, Denmark

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