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Green light may be a new painkiller – but how?

NCT ID NCT05295225

Knowledge-focused Sponsor: University of Arizona 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 2 times

Summary

This study tests whether green light can reduce pain by looking at brain activity in 30 healthy adults. Participants are exposed to green or white light for two hours while researchers measure pain pathways and brain waves. The goal is to understand how green light works, not to treat pain directly.

What this could mean

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

Active substance
Green Light Emitting Diode (GLED) device
What this could lead to
If successful, this could help explain how green light reduces pain, potentially leading to new non-drug pain relief methods.
What could go wrong
This is a very early, small study in healthy people without chronic pain, so results may not apply to patients. It only looks at brain activity, not actual pain relief.

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 30 people

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

Started

Jun 2022

Expected to finish

Dec 2026

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 to 50 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: 1. 18-50 years healthy men or women 2. Able to speak and understand English 3. No history of Chronic pain 4. No known neuropathies in areas that testing will take place, (forearms, muscle at the base of thumb on the palm of the hand and upper back/shoulder area. Exclusion Criteria: 1. Serious mental illness defined as distortions of perception, delusions, hallucinations, and unusual behaviors resulting in loss of contact with reality. This will be assessed during the screening interview. 2. Colorblindness or uncorrected cataracts. 3. Tissue damage in areas that testing will take place, (forearms, muscle at the base of the thumb on the palm of the hand, and upper back/should area.

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Conditions

The condition(s) this trial relates to.

Chronic Pain chronic pain syndrome

As listed by the trial registrant

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

Chronic pain

Contacts and locations

Locations

  • Banner University Medical Center Tucson

    Tucson, Arizona, 85724, United States

More trials for these conditions

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