Healthy volunteers · Illinois
Studies for healthy volunteers in Illinois
285 studies have at least one recruiting site in Illinois. These studies say in their official record that they accept healthy volunteers. Many are Phase 1 studies that test how a new medicine is absorbed and tolerated; others recruit healthy people as a comparison group alongside patients.
285 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
Studies
- RecruitingHealthy volunteers
Extensively Hydrolyzed Formula Growth Monitioring Study (GMS)
Mead Johnson Nutrition
- Location
- Moline, IL + 9 other US sites
- Eligibility basics
- Ages 0 mo–0 mo
- RecruitingHealthy volunteersPhase 3
A Study to Learn About How a New Pneumococcal Vaccine Works in Infants.
Pfizer
- Location
- Moline, IL + 101 other US sites
- Eligibility basics
- Ages 1 mo–7 mo
- RecruitingHealthy volunteersPhase 4
Study of a Recombinant Spike COVID-19 Vaccine With Matrix-M in Older Adults and People at Increased Risk of Severe COVID-19
Sanofi
- Location
- Melrose Park, IL + 19 other US sites
- Eligibility basics
- Ages 12+
- RecruitingHealthy volunteersPhase 3
A Study to Assess the Safety, Tolerability, and Immunogenicity of 3 Lots of a Multivalent Pneumococcal Conjugate Vaccine Administered to Adults
Pfizer
- Location
- Melrose Park, IL + 36 other US sites
- Eligibility basics
- Ages 18–49
- RecruitingHealthy volunteersPhase 3
A Study to Learn About a Clostridioides Difficile Vaccine in People 65 Years of Age and Older
Pfizer
- Location
- Melrose Park, IL + 138 other US sites
- Eligibility basics
- Ages 65+
- RecruitingHealthy volunteers
Effect of a Dietary Supplement Versus Placebo on Serum PFAS Levels in Male Firefighters
Cambiotics ApS
- Location
- Chicago, IL
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteers
BoxX-NoAF Clinical Trial
AtriCure, Inc.
- Location
- Chicago, IL + 30 other US sites
- Eligibility basics
- Ages 65+
- RecruitingHealthy volunteers
Observational Study of Decentralized Urine Optical Interaction Patterns Associated With Environmental Microplastic and Nanoplastic Exposure
Ecotera Health LLC
- Location
- Chicago, IL + 50 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Evaluation of Approved Contact Lenses (CR-6657)
Johnson & Johnson Vision Care, Inc.
- Location
- Franklin Park, IL + 3 other US sites
- Eligibility basics
- Ages 18–39
- RecruitingHealthy volunteers
The Effects of Daily Supplementation of a Soluble Fiber on the Fecal Microbiota in Volunteers.
Roquette Freres
- Location
- Addison, IL
- Eligibility basics
- Ages 18–60
- RecruitingHealthy volunteers
A Randomized Comparison of Stage-Based Care Versus Risk Factor-Based Care for Prevention of Cardiovascular Events
Cleerly, Inc.
- Location
- Chicago, IL + 121 other US sites
- Eligibility basics
- Ages 55+
- RecruitingHealthy volunteersPhase 3
A Study on the Efficacy of a Vaccine Against Influenza in Adults ≥65 Years of Age
GlaxoSmithKline
- Location
- Chicago, IL + 130 other US sites
- Eligibility basics
- Ages 65+
- RecruitingHealthy volunteersPhase 3
A Study to Learn About the Safety of an Expanded Pneumococcal Vaccine in Healthy Infants
Pfizer
- Location
- Chicago, IL + 20 other US sites
- Eligibility basics
- Ages 1 mo–4 mo
- RecruitingHealthy volunteers
Falcon Real World Evidence Registry
Exact Sciences Corporation
- Location
- Evanston, IL + 1 other US site
- Eligibility basics
- Ages 50–80
- RecruitingHealthy volunteers
Effects of Continuous Yogurt Intake on Immunomodulatory Function and Subjective Health Status in Healthy U.S. Adults
Meiji Co., Ltd.
- Location
- Chicago, IL
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
A Prospective Controlled Study to Evaluate the Safety and Effectiveness of Thermage® FLX Radiofrequency Treatment
Bausch Health Americas, Inc.
- Location
- Chicago, IL + 5 other US sites
- Eligibility basics
- Ages 30–60
- RecruitingHealthy volunteers
An Evaluation of Long-Term Supplement Use on Biological Age and Metabolic Health Markers - The BioAge Trial
Shaklee Corporation
- Location
- Addison, IL
- Eligibility basics
- Ages 40+
- RecruitingHealthy volunteers
Tempus Open Link for Individual Voices in Innovative Analytics Registry: Platform Protocol for Multimodal Real-World Evidence in Cancer
Tempus AI
- Location
- Chicago, IL
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Shield Post-Approval Study Protocol
Guardant Health, Inc.
- Location
- Bourbonnais, IL + 48 other US sites
- Eligibility basics
- Ages 45–81
- RecruitingHealthy volunteers
Intalight Reference Database Protocol for VG200D
Intalight, Inc
- Location
- Chicago, IL + 2 other US sites
- Eligibility basics
- Ages 22+
- RecruitingHealthy volunteers
Motiva Implants® Post-Approval Study
Motiva USA LLC
- Location
- Chicago, IL + 32 other US sites
- Eligibility basics
- Ages 22+ · Women only
- RecruitingHealthy volunteers
A Multi-Site Study to Assess the Effect of Availability of a Heated Tobacco Product on Smoking Abstinence Among Current Primary Cigarette Smokers
RAI Services Company
- Location
- Aurora, IL + 7 other US sites
- Eligibility basics
- Ages 21–65
- RecruitingHealthy volunteers
Multicenter Trial of Antibiotic Eluting Graft for Promoting New Bone Growth in/Near Infected Bone Cavities
Elute, Inc.
- Location
- Skokie, IL + 11 other US sites
- Eligibility basics
- Ages 22+
- RecruitingHealthy volunteers
Development of a Home Test for Measuring Blood P-tau217 in Alzheimer's Disease Using the Tasso Lancet Device
Neurogen Biomarking LLC
- Location
- Chicago, IL
- Eligibility basics
- Ages 40–90
Who these studies look for
“Healthy” is decided at screening, not by you. Sites usually check vital signs, blood and urine tests, an ECG, your medications and sometimes your BMI or smoking status. A study can still turn you away for reasons that have nothing to do with being unwell, such as timing or a full roster.
Matching a page like this one never means you qualify. Each research team decides eligibility at screening.
Questions
Do healthy volunteer studies pay?
Many do, because volunteers give up time and follow strict schedules, but amounts are set by each study and are usually only confirmed by the research site. When a record states an amount we show the exact wording; otherwise we say compensation is not disclosed.
What happens at a screening visit?
Expect consent paperwork first, then a health questionnaire, vital signs, blood and urine samples and often an ECG. You can ask questions and withdraw at any time, before or after you sign.