Healthy volunteer studies in O'Fallon, MO
12 studies at sites in and around O'Fallon accept healthy volunteers — people without the condition being studied. Many studies pay participants for their time and travel; the amount is set by each study, so ask the study team.
Testing an Enhanced Digital Delivery Model for Inherited Cancer Genetic Testing in Young Adults With Cancer
RecruitingHealthy volunteers welcome
- Mercy Oncology and Hematology - Clayton-Clarkson, Ballwin · 17 mi away
- Mercy Hospital Washington, Washington · 24 mi away
Family Communications After Genetic Testing
RecruitingHealthy volunteers welcome
- Mercy Oncology and Hematology - Clayton-Clarkson, Ballwin · 17 mi away
- Mercy Hospital Washington, Washington · 24 mi away
Studying the PAGODA Algorithm for Chemotherapy Dose Changes to Prevent Unplanned Treatment Delays
RecruitingHealthy volunteers welcome
- Mercy Oncology and Hematology - Clayton-Clarkson, Ballwin · 17 mi away
- Mercy Hospital Washington, Washington · 24 mi away
Collecting Blood Samples From Patients With and Without Cancer to Evaluate Tests for Early Cancer Detection
RecruitingObservational studyHealthy volunteers welcome
- Saint Luke's Hospital, Chesterfield · 12 mi away
- Mercy Oncology and Hematology - Clayton-Clarkson, Ballwin · 17 mi away
- Mercy Hospital Washington, Washington · 24 mi away
A Study to Assess the Safety, Tolerability, and Immunogenicity of 3 Lots of a Multivalent Pneumococcal Conjugate Vaccine Administered to Adults
RecruitingPhase 3Healthy volunteers welcome
- Clinical Research Professionals, Chesterfield · 12 mi away
A Study on the Efficacy of a Vaccine Against Influenza in Adults ≥65 Years of Age
RecruitingPhase 3Healthy volunteers welcome
- GSK Investigational Site, Chesterfield · 12 mi away
A Study of Aleniglipron in Adults With Obesity or Overweight and Type 2 Diabetes Mellitus (ACCOMPLISH-2)
RecruitingPhase 3Healthy volunteers welcome
- ACCOMPLISH-2 Research Site, City of Saint Peters · 4 mi away
- ACCOMPLISH-2 Research Site, Chesterfield · 12 mi away
A Pilot Study to Evaluate the Ability of Lactoferrin to Modulate Iron Homeostasis and Exercise Performance in Exercising Females
RecruitingHealthy volunteers welcome
- Exercise and Performance Nutrition Laboratory, Saint Charles · 12 mi away
Dose-Response Impact of Geranylgeraniol (GG) Supplementation on Muscle Health
RecruitingHealthy volunteers welcome
- Lindenwood University Exercise and Performance Nutrition Laboratory, Saint Charles · 12 mi away
Evaluating Whether an Educational Website Called Current Together After Cancer (CTAC) Improves Follow-up Care for Colorectal Cancer Survivors
RecruitingPhase 3Healthy volunteers welcome
- Mercy Oncology and Hematology - Clayton-Clarkson, Ballwin · 17 mi away
- Mercy Hospital Washington, Washington · 24 mi away
Impact of Weizmannia (Bacillus) Coagulans JBI-YZ6.3 on Gut Health and Fecal Microbiome Changes
RecruitingHealthy volunteers welcome
- Lindenwood University, Saint Charles · 12 mi away
Dose-Response Impact of Glucosyl-Hesperidin (CitraPeak) on Exercise Performance, Blood Flow, Stress, Cognition, and Other Perceptual Indicators
RecruitingHealthy volunteers welcome
- Lindenwood University, Saint Charles · 12 mi away
From ClinicalTrials.gov, data retrieved Oct 6, 2026. Each study sets its own eligibility; the study team decides who can join.