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 2026-10-13 (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.
United States
Researchers use detailed images of the retina and its blood vessels to look for markers of conditions affecting brain cells.
Learning by observing or collecting information
Age 18 years and over · Also accepts healthy volunteers
Netherlands
Researchers are investigating treatment in people whose enzymes or gut bacteria may break down levodopa before it works.
Testing a treatment or activity
Age range not listed · Ask the team who can join
Italy
Researchers test whether arm rehabilitation using sensors and a robot affects thinking and movement in adults with neurological conditions.
Testing a treatment or activity
Ages 18 years to 75 years · Does not accept healthy volunteers
United States
Researchers study whether repeated stimulation through the head affects movement and movement-related tiredness in Parkinson’s.
Testing a treatment or activity
Age range not listed · Does not accept healthy volunteers
Brazil
Researchers compare walking practice with and without added electrical brain stimulation, looking at walking and balance in Parkinson’s.
Testing a treatment or activity
Ages 50 years to 75 years · Does not accept healthy volunteers
Belgium
Researchers study whether a new imaging substance can measure a protein called Hsp90 in the human brain.
Testing a treatment or activity
Ages 18 years to 70 years · Also accepts healthy volunteers
United States
Researchers compare strength exercises using heavier or lighter loads, measuring strength, power and everyday performance in older adults with Parkinson’s.
Testing a treatment or activity
Ages 50 years to 85 years · Does not accept healthy volunteers
Pakistan
Researchers study whether rhythm cues delivered through personalised music affect walking and balance in Parkinson’s.
Testing a treatment or activity
Ages 45 years to 55 years · Does not accept healthy volunteers
Belgium, Netherlands
Researchers compare stimulation that adapts to brain signals with stimulation delivered continuously in people with Parkinson’s.
Testing a treatment or activity
Age 18 years and over · Does not accept healthy volunteers
Switzerland
Researchers study the ratio of carbidopa to levodopa in people who experience low blood pressure on standing and have Parkinson’s or a related condition.
Testing a treatment or activity
Age range not listed · Does not accept healthy volunteers
Turkey
Researchers study exercises that let people see feedback about their performance in Parkinson’s rehabilitation.
Testing a treatment or activity
Ages 18 years to 85 years · Does not accept healthy volunteers
United States
Researchers study a device that delivers electrical stimulation through the head, checking its effects on movement problems in Parkinson’s.
Testing a treatment or activity
Ages 18 years to 80 years · Does not accept healthy volunteers
United States
Researchers look for scan features that help identify Parkinson’s-related conditions and predict how quickly they may change.
Learning by observing or collecting information
Age range not listed · Also accepts healthy volunteers
United States
Researchers study movement-related brain networks in Parkinson’s to help develop more targeted implanted stimulation.
Learning by observing or collecting information
Age 21 years and over · Ask the team who can join
United States
Researchers study beneficial and unwanted movement effects of stimulating different locations in a deep brain area in Parkinson’s.
Testing a treatment or activity
Ages 21 years to 89 years · Does not accept healthy volunteers
Canada
Researchers check whether scan-guided focused ultrasound can safely help deliver an enzyme called GCase into a target brain area.
Testing a treatment or activity
Ages 35 years to 80 years · Does not accept healthy volunteers
Italy
Researchers study a preparation based on compounds found in plants, investigating its use in conditions affecting brain cells.
Testing a treatment or activity
Ages 1 year to 75 years · Does not accept healthy volunteers
Egypt
Researchers investigate whether adding fexofenadine to usual care affects Parkinson’s.
Testing a treatment or activity
Ages 50 years to 70 years · Does not accept healthy volunteers
Canada
Researchers study how a brain area helps transfer walking skills learned on a treadmill to other walking tasks in Parkinson’s.
Testing a treatment or activity
Age 50 years and over · Does not accept healthy volunteers
Canada
Researchers assess people with several types of dementia and a comparison group without thinking difficulties, following changes over time.
Learning by observing or collecting information
Ages 50 years to 90 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: 2026-10-13
4689 related source records before matching duplicates
Import available
Last complete check: 2026-10-13
4384 related source records before matching duplicates
Import available
Last complete check: 2026-10-13
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.