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Sniffing lemon oil boosts attention in kids with ADHD, study finds

NCT ID NCT07586761

Symptom relief Sponsor: Başakşehir Çam & Sakura City Hospital 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study tested whether smelling lemon essential oil for 5 minutes could improve attention in 52 children aged 9-16 with ADHD who were not on medication. The children were randomly assigned to inhale either lemon oil or a placebo before taking attention and memory tests. Results showed that those who smelled lemon oil had significantly better sustained attention scores compared to the placebo group.

What this could mean

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

Active substance
lemon essential oil
What this could lead to
If this works, it could offer a simple, non-drug option to help children with ADHD focus better during tasks.
What could go wrong
This was a small, single-session study with only 52 children. The effects may not last or work for everyone, and more research is needed.

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

52 people

The number who actually took part.

Started

Feb 2022

Finished

Sep 2023

Lead sponsor

A government agency

The lead sponsor is a government body.

Who can take part

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

Ages

9 to 16 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: * Children aged 9 to 16 years * Diagnosis of Attention Deficit Hyperactivity Disorder (ADHD) based on DSM-5 criteria * Medication-naive (not currently using or previously treated with pharmacological agents for ADHD) * No chronic medical or psychiatric comorbidities * Capable of completing standardized cognitive assessments (e.g., D2 Attention Test, Benton Visual Memory Test) * Written informed consent obtained from a parent or legal guardian * Written assent obtained from the child Exclusion Criteria: * Lack of written parental consent or child assent * Inability to comply with the study protocol (e.g., refusal to complete cognitive testing or intervention procedure) * Current or prior use of ADHD medication * Presence of moderate-to-severe ADHD symptoms requiring immediate pharmacological treatment (based on AACAP 2020 and NICE 2019 guidelines) * Presence of any chronic medical or psychiatric comorbid condition * Diagnosis not confirmed by a board-certified child and adolescent psychiatrist

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Conditions

The condition(s) this trial relates to.

attention deficit hyperactivity disorder, inattentive type attention deficit-hyperactivity disorder

As listed by the trial registrant

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

Aromatherapy Attention deficit disorder with hyperactivity (ADHD) Essential oil Non-pharmacological interventions Sustained attention

Contacts and locations

Locations

  • Basaksehir Cam ve Sakura City Hospital

    Istanbul, Turkey (Türkiye)

More trials for these conditions

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