Is GuineaPig free to use?

Yes, completely free. GuineaPig pulls data from ClinicalTrials.gov and adds compensation estimates, eligibility matching, and category filters to make it easier to browse. We don't charge volunteers or collect payment information.

How does GuineaPig estimate compensation?

Pay ranges are rough estimates based on the study's phase, duration, and typical industry rates. Phase 1 inpatient studies tend to pay the most because they require overnight stays. These are not confirmed by sponsors — always contact the study team directly for the actual compensation.

How often is trial data updated?

Trial listings are pulled from ClinicalTrials.gov in real time. New studies appear as soon as sponsors register them with the NIH. Study status, enrollment counts, and location data are updated whenever sponsors submit changes to the registry.

Does GuineaPig screen me or sign me up?

No. GuineaPig is a search tool only. When you find a trial you're interested in, click 'View on ClinicalTrials.gov' to get the study team's contact information. You'll go through the sponsor's own screening and enrollment process.

Vaccine Clinical Trials
for Healthy Volunteers

Vaccine trials are among the most common studies for healthy volunteers. Pharmaceutical companies need thousands of participants to test new flu, COVID, RSV, and other vaccines.

447

Active Trials

$1,500 - $4,000

Typical Pay (estimated)

2-8 weeks

Duration

Most vaccine trials have multiple payment visits

Featured Trial

Highest Paying in Category

$1,950 – $18,000

Estimated compensation

A Study on the Safety and Immune Response of a Urinary Tract Infection (UTI) Vaccine in Adults 18-64 Years of Age and Clinical Efficacy in Females 18-64 Years of Age

GlaxoSmithKline

LenexaPhase 1 / Phase 2448 enrolling

View trial details

All Vaccine Trials

View all 447

High PayingPhase 1

$1,500 – $12,000

Est. compensation

A Study of BBT002 in Healthy Volunteers (HVs) and in Adult Patients With Chronic Obstructive Pulmonary Disease (COPD)

Bambusa Therapeutics

Perth, Western Australia98 enrolling

High PayingPhase 1

$1,500 – $8,000

Est. compensation

A Phase 1 Comparative Study to Evaluate Pharmacokinetics, Immunogenicity, Safety and Tolerability of Bmab3000 and Herceptin Hylecta® After a Single 600 mg SC Injection in Healthy Male Volunteers

Biocon Biologics UK PLC

Christchurch, Main Building: 264 Antigua Street,150 enrolling

Observational

$25 – $500

Est. compensation

Dysbiosis & Long COVID

University of Chicago

Chicago, Illinois400 enrolling

Observational

$25 – $500

Est. compensation

An Observational Study to Assess Effectiveness and Safety of The R21/Matrix-M Malaria Vaccine

Serum Institute of India Pvt. Ltd.

Bousse, Burkina Faso2,308 enrolling

N/A

$50 – $1,000

Est. compensation

Monitoring of Measles-specific Immune Status in Adult Allogeneic Hematopoietic Stem Cell Transplant Recipients

Hospices Civils de Lyon

Lyon60 enrolling

High PayingPhase 1

$1,500 – $12,000

Est. compensation

Safety, Tolerability and PK of ATTO-3712 in Healthy Volunteers and Patients With Atopic Dermatitis

Attovia Therapeutics Inc

Montreal, Quebec72 enrolling

High PayingPhase 1

$1,500 – $8,000

Est. compensation

To Evaluate the Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, and Immunogenicity of GB18 Injection in Healthy Participants

Shenzhen Kexing Pharmaceutical Co., Ltd.

Beijing, Beijing Municipality36 enrolling

High PayingPhase 1

$1,500 – $12,000

Est. compensation

A Phase 1 Study of CLYM116 in Normal Healthy Volunteers

Climb Bio, Inc.

Brisbane48 enrolling

Phase 4

$100 – $1,500

Est. compensation

The Dynamics of the Immune Responses to Repeat Influenza Vaccination Exposures (DRIVE III) Study

The University of Hong Kong

Hong Kong600 enrolling

High PayingPhase 2

$500 – $7,000

Est. compensation

Study of Co-administered (Types 1 & 2) Novel Oral Poliomyelitis Vaccines Evaluation

PATH

Panama City675 enrolling

High PayingPhase 1

$1,500 – $12,000

Est. compensation

Safety, Tolerability, and Pharmacokinetics of Single Doses of HC022 in Healthy Subjects.

HC Biopharma Inc.

Beijing38 enrolling

View all 447 trials

Explore Other Categories

Psychedelic Weight Loss Diet & Nutrition Brain & Neuroscience Pharmaceutical Drug Studies

Learn more: How Much Do Trials Pay? · First-Timer's Guide

GuineaPig pulls live data from ClinicalTrials.gov (NIH/NLM). Pay estimates are approximate ranges based on study type and are not confirmed by sponsors. Eligibility indicators use limited criteria only. We do not provide medical advice. Always contact the study team directly to confirm compensation, full eligibility, and risks before enrolling.

Vaccine Clinical Trialsfor Healthy Volunteers

Featured Trial

A Study on the Safety and Immune Response of a Urinary Tract Infection (UTI) Vaccine in Adults 18-64 Years of Age and Clinical Efficacy in Females 18-64 Years of Age

All Vaccine Trials

A Study of BBT002 in Healthy Volunteers (HVs) and in Adult Patients With Chronic Obstructive Pulmonary Disease (COPD)

A Phase 1 Comparative Study to Evaluate Pharmacokinetics, Immunogenicity, Safety and Tolerability of Bmab3000 and Herceptin Hylecta® After a Single 600 mg SC Injection in Healthy Male Volunteers

Dysbiosis & Long COVID

An Observational Study to Assess Effectiveness and Safety of The R21/Matrix-M Malaria Vaccine

Monitoring of Measles-specific Immune Status in Adult Allogeneic Hematopoietic Stem Cell Transplant Recipients

Safety, Tolerability and PK of ATTO-3712 in Healthy Volunteers and Patients With Atopic Dermatitis

To Evaluate the Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, and Immunogenicity of GB18 Injection in Healthy Participants

A Phase 1 Study of CLYM116 in Normal Healthy Volunteers

The Dynamics of the Immune Responses to Repeat Influenza Vaccination Exposures (DRIVE III) Study

Study of Co-administered (Types 1 & 2) Novel Oral Poliomyelitis Vaccines Evaluation

Safety, Tolerability, and Pharmacokinetics of Single Doses of HC022 in Healthy Subjects.

Explore Other Categories

Vaccine Clinical Trialsfor Healthy Volunteers

Featured Trial

A Study on the Safety and Immune Response of a Urinary Tract Infection (UTI) Vaccine in Adults 18-64 Years of Age and Clinical Efficacy in Females 18-64 Years of Age

All Vaccine Trials

A Study of BBT002 in Healthy Volunteers (HVs) and in Adult Patients With Chronic Obstructive Pulmonary Disease (COPD)

A Phase 1 Comparative Study to Evaluate Pharmacokinetics, Immunogenicity, Safety and Tolerability of Bmab3000 and Herceptin Hylecta® After a Single 600 mg SC Injection in Healthy Male Volunteers

Dysbiosis & Long COVID

An Observational Study to Assess Effectiveness and Safety of The R21/Matrix-M Malaria Vaccine

Monitoring of Measles-specific Immune Status in Adult Allogeneic Hematopoietic Stem Cell Transplant Recipients

Safety, Tolerability and PK of ATTO-3712 in Healthy Volunteers and Patients With Atopic Dermatitis

To Evaluate the Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, and Immunogenicity of GB18 Injection in Healthy Participants

A Phase 1 Study of CLYM116 in Normal Healthy Volunteers

The Dynamics of the Immune Responses to Repeat Influenza Vaccination Exposures (DRIVE III) Study

Study of Co-administered (Types 1 & 2) Novel Oral Poliomyelitis Vaccines Evaluation

Safety, Tolerability, and Pharmacokinetics of Single Doses of HC022 in Healthy Subjects.

Explore Other Categories

Vaccine Clinical Trials
for Healthy Volunteers

Vaccine Clinical Trials
for Healthy Volunteers