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Popular hair and nail vitamin may skew your blood work

NCT ID NCT07302880

Knowledge-focused Sponsor: University of Copenhagen 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 looks at how taking biotin (vitamin B7) supplements can interfere with certain blood tests. Researchers will give 24 healthy adults either a single dose of biotin (10 mg or 100 mg) or a placebo, then take blood samples over several hours to see how test results change. The goal is to understand when the interference is strongest and how long it lasts.

What this could mean

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

Active substance
biotin (vitamin B7)
What this could lead to
If successful, this could help doctors know how long to wait after taking biotin before getting accurate blood test results.
What could go wrong
This is a small, early study with only 24 healthy participants, so findings may not apply to everyone or to all types of blood tests.

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 24 people

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

Started

Mar 2026

Expected to finish

Oct 2030

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 70 years

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: * Male or female between 20-70 years of age at time of screening * Body mass index of 18.6-25 kg/m2 Exclusion criteria: * Severe liver disease (estimated by FIB4 score \> 3.25) * Type 2 diabetes according to ADA criteria (estimated by HbA1c levels of ≥ 48 mmol/mol) * Significant history of alcoholism or drug/chemical abuse as per investigators judgement * Kidney disease defined as serum creatinine levels ≥ 126 μmol/L for male and ≥ 111 μmol/L for female or eGFR \< 60 ml/min/1.73 m2 * Cardiac problems (defined as troponin T levels \> 10 ng/L for woman and \>19 ng/L for men) or including any of the following, based on medical history: * Classified as being in New York Heart Association (NYHA) class III or IV * Angina pectoris (chest pain) within the last 6 months * Acute myocardial infarction (heart attack) within last 2 years * Cancer within the past 1 year * Anemia (hemoglobin \<8.3 mmol/L for men and \<7.3 mmol/L for women) * Pregnancy (requires negative pregnancy test) or breast feeding * Smoking * Any medicine, acute illness (within the last two weeks) or other circumstances that in the opinion of the investigator might endanger the participants' safety or compliance with the protocol

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As listed by the trial registrant

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

Biotin ingestion Blood sample Interference with routine analyical tests

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

  • Department of Clinical Biochemistry, Bispebjerg University Hospital, Copenhagen

    RECRUITING

    Copenhagen, Denmark