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CBD's effect on brain inflammation tested in healthy volunteers

NCT ID NCT04398719

Knowledge-focused Sponsor: Yale University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 early-phase study looked at how a single dose of cannabidiol (CBD) affects brain inflammation and pain sensitivity in 28 healthy adults. Researchers used brain scans to measure inflammation and a skin cream test to check pain response. The goal was to understand CBD's potential role in pain treatment, not to treat any disease.

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

Early phase 1

The earliest testing in people: a first look at safety, in a very small group.

Participants

28 people

The number who actually took part.

Started

May 2021

Finished

Dec 2024

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 55 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. Men and women aged 18- 55 years 2. No significant medical or neurological illness 3. No implanted metal devices that may pose a risk during MRI scanning 4. Within the annual permissible radiation exposure 5. Able to provide written informed consent. Exclusion Criteria: 1. Current use of any medications 2. Presence of metal in the body 3. Pregnancy or lactation

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Conditions

The condition(s) this trial relates to.

red-green color blindness

As listed by the trial registrant

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

CBD Healthy

Contacts and locations

Locations

  • Connecticut Mental Health Center

    New Haven, Connecticut, 06519, United States

More trials for these conditions

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