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.

Diet & Nutrition Trials
for Healthy Volunteers

From gut microbiome research to supplement testing, diet and nutrition studies are growing fast. These trials often have simpler protocols and shorter commitments.

2,606

Active Trials

$500 - $2,000

Typical Pay (estimated)

1-4 weeks

Duration

Great for first-time participants

Featured Trial

Highest Paying in Category

$1,950 – $18,000

Estimated compensation

A Study to Assess the Relative Bioavailability of BMS-986435 and Food Effect on the BMS-986435 in Healthy Adult Participants

Bristol-Myers Squibb

MiamiPhase 1140 enrolling

View trial details

All Diet Trials

View all 2,606

N/A

$50 – $1,000

Est. compensation

The Food for Health Study

University of Montana

Arlee, Montana43 enrolling

N/A

$50 – $1,000

Est. compensation

Gut Microbiota-Mediated Inflammatory Interactions Between AUD and HIV Infection

Rush University Medical Center

Chicago, Illinois40 enrolling

High PayingPhase 1

$1,500 – $12,000

Est. compensation

A Research Study Looking Into How NNC0662-0419 Works With Birth Control Pills and Emptying of the Stomach in Women Not Able to Become Pregnant With Excess Body Weight

Novo Nordisk A/S

Overland Park, Kansas45 enrolling

Observational

$25 – $500

Est. compensation

Sample Collection From Healthy Volunteers for Assay Optimization

National Institute of Allergy and Infectious Diseases (NIAID)

Bethesda, Maryland600 enrolling

N/A

$50 – $1,000

Est. compensation

Mucosal IgE to Improve Diagnosis of Food Allergy and Food Hypersensitivity

University of Erlangen-Nürnberg Medical School

Erlangen115 enrolling

N/A

$50 – $1,000

Est. compensation

Frequency of Interrupting Sitting and Cognitive Function

Maastricht University Medical Center

Maastricht33 enrolling

Observational

$25 – $500

Est. compensation

Adult and Juvenile Myositis

National Institute of Environmental Health Sciences (NIEHS)

Atlanta, Georgia1,200 enrolling

N/A

$50 – $1,000

Est. compensation

Dietary Strategy to Tackle Cognitive and Locomotor Abilities in Early Elderly Subjects

University Rovira i Virgili

Logroño, Spain72 enrolling

High PayingEarly Phase 1

$1,500 – $12,000

Est. compensation

Single and Multiple Ascending Doses of NTX-253 in Healthy Participants and Participants With Stable Schizophrenia

Neurosterix

Los Alamitos, California73 enrolling

Observational

$25 – $500

Est. compensation

The Physiology of Human Brown Adipose Tissue

Beth Israel Deaconess Medical Center

Boston, Massachusetts40 enrolling

Phase 3

$200 – $3,000

Est. compensation

Comparison of Transanal Irrigation and Glycerol Suppositories in Treatment of Low Anterior Resection Syndrome

University of Aarhus

Aarhus114 enrolling

View all 2,606 trials

Explore Other Categories

Psychedelic Vaccine Weight Loss 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.

Diet & Nutrition Trialsfor Healthy Volunteers

Featured Trial

A Study to Assess the Relative Bioavailability of BMS-986435 and Food Effect on the BMS-986435 in Healthy Adult Participants

All Diet Trials

The Food for Health Study

Gut Microbiota-Mediated Inflammatory Interactions Between AUD and HIV Infection

A Research Study Looking Into How NNC0662-0419 Works With Birth Control Pills and Emptying of the Stomach in Women Not Able to Become Pregnant With Excess Body Weight

Sample Collection From Healthy Volunteers for Assay Optimization

Mucosal IgE to Improve Diagnosis of Food Allergy and Food Hypersensitivity

Frequency of Interrupting Sitting and Cognitive Function

Adult and Juvenile Myositis

Dietary Strategy to Tackle Cognitive and Locomotor Abilities in Early Elderly Subjects

Single and Multiple Ascending Doses of NTX-253 in Healthy Participants and Participants With Stable Schizophrenia

The Physiology of Human Brown Adipose Tissue

Comparison of Transanal Irrigation and Glycerol Suppositories in Treatment of Low Anterior Resection Syndrome

Explore Other Categories

Diet & Nutrition Trialsfor Healthy Volunteers

Featured Trial

A Study to Assess the Relative Bioavailability of BMS-986435 and Food Effect on the BMS-986435 in Healthy Adult Participants

All Diet Trials

The Food for Health Study

Gut Microbiota-Mediated Inflammatory Interactions Between AUD and HIV Infection

A Research Study Looking Into How NNC0662-0419 Works With Birth Control Pills and Emptying of the Stomach in Women Not Able to Become Pregnant With Excess Body Weight

Sample Collection From Healthy Volunteers for Assay Optimization

Mucosal IgE to Improve Diagnosis of Food Allergy and Food Hypersensitivity

Frequency of Interrupting Sitting and Cognitive Function

Adult and Juvenile Myositis

Dietary Strategy to Tackle Cognitive and Locomotor Abilities in Early Elderly Subjects

Single and Multiple Ascending Doses of NTX-253 in Healthy Participants and Participants With Stable Schizophrenia

The Physiology of Human Brown Adipose Tissue

Comparison of Transanal Irrigation and Glycerol Suppositories in Treatment of Low Anterior Resection Syndrome

Explore Other Categories

Diet & Nutrition Trials
for Healthy Volunteers

Diet & Nutrition Trials
for Healthy Volunteers