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Forest bathing tested as fatigue fix for cancer survivors

NCT ID NCT06931132

Symptom relief Sponsor: Robert Bosch Gesellschaft für Medizinische Forschung mbH (RBMF) 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Jun 26, 2026

Summary

This study tests whether nature-based therapies can reduce fatigue and improve sleep, mood, and concentration in cancer survivors. 172 participants will be assigned to real forest bathing, a virtual reality forest experience, guided imagery, or a waitlist. Each session lasts 30 minutes, once a week for 8 weeks.

What this could mean

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

Active substance
forest bathing (real, virtual reality, or guided imagery)
What this could lead to
If it works, this could offer a simple, drug-free way to help cancer survivors feel less tired and improve their quality of life.
What could go wrong
This is a small, early-stage trial with no blinding, so results may be influenced by expectations. The effects may be modest and not apply to all survivors.

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 172 people

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

Started

Jun 2025

Expected to finish

Dec 2027

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: * Patients who have completed treatment for cancer (\*with the exception of long-term adjuvant endocrine therapy). * Subjective Impairment due to Cancer-Related Fatigue (CrF) . NCCN-recommended questions are used for screening ("How exhausted do you feel on a scale of 0 to 10?" and "How impaired do you feel by this fatigue on a scale of 0 to 10?" (threshold \>4 on either scale). * At the time of study inclusion, it must be expected that no further antitumor therapy measures will be started within the next 6 months. * Patients must be able to refrain from smoking up to 15 minutes before the intervention (smoking within 15 minutes before therapy impairs the participant's ability to perceive the aroma of the phytoncides). * Written and valid informed consent from the patient. Exclusion Criteria: * Presence of inadequately controlled major depression in the opinion of the investigator. * Asthma (inhaled phytoncides may cause airway irritation, exacerbation of asthma, or bronchoconstriction). * Known allergy to pine or citrus fragrance. * Anosmie. * Medical history of seasickness (virtual reality can cause nausea/vomiting with no improvement after 5-10 minutes). * History of seizures (virtual reality may increase susceptibility to seizures due to the changing light in the forest video). * Visual and hearing impairments that are not corrected by visual or hearing aids. * Unwillingness to store and share personal medical data as part of the protocol. * Participation in another clinical trial focusing on behavioural or complementary medicine interventions. * Missing or incomplete consent form.

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Conditions

The condition(s) this trial relates to.

cancer Fatigue

As listed by the trial registrant

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

Cancer survivors

How to take part

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

  1. The places running it

    2 sites. The list below names each one and where it is.

  2. The official record

    The full official record for this study. This one lists no contact details, but it is the first place any would appear.

    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

  • Dr med. Marcela Winkler

    Stuttgart, Baden-Wurttemberg, 70439, Germany

  • PD Dr. Claudia Löffler

    Würzburg, Bavaria, 97080, Germany

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