TAKE PART IN RESEARCH
Research explained in everyday language. Explore what teams around the world are trying to learn, who can take part and how to get in touch.
See worldwide coverage and update dates ↓Studies with early results appear under “Results reported” even if recruitment continues.
Registry records retrieved 2026-10-11 (UTC). Individual records may have older updates. Recruitment and eligibility must be confirmed with the study team.
A location is a starting point. Ask the team whether that site is accepting people and whether you can take part from where you live.
Introductions are AI-written from the registry in everyday language and have not been independently checked by a clinician. Open any study for its full name, original description and participation rules.
Studies name Parkinson’s or a related condition. Some include other conditions or healthy volunteers. Country filters use sites with matching or unreported status. A country recorded by WHO does not confirm an open local site.
Canada
Researchers are investigating whether low-intensity sound waves aimed at the brain can be used to influence brain activity.
Testing a treatment or activity
Ages 18 years to 85 years · Also accepts healthy volunteers
United States
Researchers study whether a tailored amino acid supplement, containing building blocks of protein, affects nutrition, body composition and physical function in Parkinson’s.
Testing a treatment or activity
Ages 50 years to 90 years · Does not accept healthy volunteers
United States
Researchers study different forms and possible biological causes of Parkinson’s beginning before age 50.
Learning by observing or collecting information
Age 18 years and over · Also accepts healthy volunteers
United States
Researchers use repeated specialised brain scans to study changes in people with early Parkinson’s and people with signs that may precede it.
Testing a treatment or activity
Ages 18 years to 99 years · Also accepts healthy volunteers
United States
Researchers use an imaging substance to measure the amount and location of active immune cells in the brains of people being studied for Parkinson’s.
Testing a treatment or activity
Age 30 years and over · Also accepts healthy volunteers
China
Researchers study different frequencies of a stimulation method aimed at deep brain areas in people with Parkinson’s.
Testing a treatment or activity
Age range not listed · Does not accept healthy volunteers
Germany
Researchers study everyday use of apomorphine taken under the tongue, including how doses are chosen and adjusted for individual people.
Learning by observing or collecting information
Age 18 years and over · Does not accept healthy volunteers
China
Researchers study how people with Parkinson’s tolerate this study medicine and how the body handles it.
Testing a treatment or activity
Ages 35 years to 85 years · Does not accept healthy volunteers
United States
Researchers use specialised brain scans to study tau protein changes in people with and without a particular Parkinson’s-related genetic change.
Testing a treatment or activity
Ages 45 years to 85 years · Also accepts healthy volunteers
United States
Researchers study brain imaging in people with freezing of walking who are planning to receive an implanted brain stimulator.
Testing a treatment or activity
Age 40 years and over · Does not accept healthy volunteers
United States
Researchers investigate whether depression symptoms change after psilocybin therapy in people who have Parkinson’s and depression.
Testing a treatment or activity
Ages 40 years to 80 years · Does not accept healthy volunteers
United States
Researchers study connections between blood pressure, blood flow to the brain and thinking abilities in people with Parkinson’s.
Testing a treatment or activity
Age 50 years and over · Does not accept healthy volunteers
United States
Researchers study an imaging substance that measures part of the brain’s chemical signalling system in people with conditions affecting brain cells.
Testing a treatment or activity
Ages 50 years to 85 years · Also accepts healthy volunteers
Turkey
Researchers study movement practice that involves watching actions and mentally rehearsing them as part of Parkinson’s rehabilitation.
Testing a treatment or activity
Ages 18 years to 65 years · Does not accept healthy volunteers
China
Researchers compare the effects of aiming a brain stimulation method at different targets in people with Parkinson’s.
Testing a treatment or activity
Age 40 years and over · Does not accept healthy volunteers
Netherlands
This early study investigates a study medicine in volunteers with and without Parkinson's, including how the body handles it.
Testing a treatment or activity
Age range not listed · Ask the team who can join
China
Researchers study whether an injection-based experimental treatment can be given safely and tolerated by people with Parkinson’s.
Testing a treatment or activity
Ages 40 years to 70 years · Does not accept healthy volunteers
Australia, Canada, United States
Researchers compare the study treatment bemdaneprocel with a comparison surgery designed for the trial, checking both its effects and safety.
Testing a treatment or activity
Ages 45 years to 75 years · Does not accept healthy volunteers
United States
Researchers study inflammation in people with Parkinson’s, Alzheimer’s and related thinking difficulties to understand the immune system’s role.
Learning by observing or collecting information
Ages 55 years to 90 years · Also accepts healthy volunteers
Germany
Researchers study an imaging substance in Parkinson’s and multiple system atrophy, checking safety and whether repeated scans give similar measurements.
Testing a treatment or activity
Ages 50 years to 75 years · Also accepts healthy volunteers
WORLDWIDE COVERAGE
Studies are imported from ClinicalTrials.gov, WHO’s international collection and the European CTIS registry. WHO brings together national and regional registries, including records from Asia, Africa and Latin America. Recruiting and upcoming listings have English introductions; older records awaiting an introduction show their registry title.
We aim for broad worldwide coverage, but no registry includes every study. Unregistered studies, reporting delays and missing translations can leave gaps. A missing paper does not mean that no results exist.
Import available
Last complete check: 2026-10-11
4689 related source records before matching duplicates
Update needs attention; retaining the last complete import
Last complete check: 2026-10-11
4384 related source records before matching duplicates
Import available
Last complete check: 2026-10-11
73 related source records before matching duplicates
These dates show when WHO processed a registry’s data, not when every study was last updated. WHO’s “not recruiting” label does not distinguish planned, completed and follow-up studies.
Source attribution: WHO ICTRP ↗. The source records and processing dates remain available on each study page. English registration fields are preferred; original descriptions may include local-language material. Registry imports and paper matching run daily. New or changed descriptions enter an editorial queue.