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.
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
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
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 5, 2026. Each study sets its own eligibility; the study team decides who can join.