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.

Weight Loss Clinical Trials
for Healthy Volunteers

The weight loss drug market is exploding with GLP-1 drugs like Ozempic and Wegovy. Pharma companies need healthy volunteers to test next-generation treatments.

1,090

Active Trials

$3,000 - $10,000

Typical Pay (estimated)

4-12 weeks

Duration

GLP-1 studies are the fastest growing category

Featured Trial

Highest Paying in Category

$1,500 – $12,000

Estimated 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 ParkPhase 145 enrolling

View trial details

All Weight Trials

View all 1,090

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

Observational

$25 – $500

Est. compensation

The Physiology of Human Brown Adipose Tissue

Beth Israel Deaconess Medical Center

Boston, Massachusetts40 enrolling

N/A

$50 – $1,000

Est. compensation

The Role of Proprioceptive Deficits, Psychosocial Factors and Inflammation in Pregnancy-related Pelvic Girdle Pain

Hasselt University

Hasselt192 enrolling

N/A

$50 – $1,000

Est. compensation

Exercise and Protein Efficiency in T2D

University of Illinois at Urbana-Champaign

Urbana, Illinois30 enrolling

N/A

$50 – $1,000

Est. compensation

Effects of White Button Mushroom on Inflammation in Obese Postmenopausal Women at High Risk of Breast Cancer

City of Hope Medical Center

Duarte, California26 enrolling

Observational

$25 – $500

Est. compensation

The Magnitude of Inter-limb Asymmetry and Its Assocation with Inter-limb Asymmetry in Distance Runners and Non-runners

Vrije Universiteit Brussel

Ixelles-Elsene, Brussels Capital72 enrolling

N/A

$50 – $1,000

Est. compensation

Night Owl Metabolism

Johns Hopkins University

Baltimore, Maryland70 enrolling

Observational

$25 – $500

Est. compensation

Neurobehavioural and Cognitive Changes in Cancer Cachexia (CANCOG)

University of Cambridge

Cambridge50 enrolling

N/A

$50 – $1,000

Est. compensation

Iron Absorption and Losses in Young South African Women Living Without and With Overweight and Obesity

Linda Malan

Potchefstroom, North West70 enrolling

High PayingPhase 2

$500 – $7,000

Est. compensation

The Role of Islet GLP-1 in the Pathogenesis of Prediabetes

Mayo Clinic

Rochester, Minnesota60 enrolling

N/A

$50 – $1,000

Est. compensation

Food (Poly)Phenol Metabotypes and Beta-cell Mass and Function.

Azienda Ospedaliero-Universitaria di Parma

Parma, PR40 enrolling

View all 1,090 trials

Explore Other Categories

Psychedelic Vaccine 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.

Weight Loss Clinical Trialsfor Healthy Volunteers

Featured Trial

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

All Weight Trials

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

The Physiology of Human Brown Adipose Tissue

The Role of Proprioceptive Deficits, Psychosocial Factors and Inflammation in Pregnancy-related Pelvic Girdle Pain

Exercise and Protein Efficiency in T2D

Effects of White Button Mushroom on Inflammation in Obese Postmenopausal Women at High Risk of Breast Cancer

The Magnitude of Inter-limb Asymmetry and Its Assocation with Inter-limb Asymmetry in Distance Runners and Non-runners

Night Owl Metabolism

Neurobehavioural and Cognitive Changes in Cancer Cachexia (CANCOG)

Iron Absorption and Losses in Young South African Women Living Without and With Overweight and Obesity

The Role of Islet GLP-1 in the Pathogenesis of Prediabetes

Food (Poly)Phenol Metabotypes and Beta-cell Mass and Function.

Explore Other Categories

Weight Loss Clinical Trialsfor Healthy Volunteers

Featured Trial

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

All Weight Trials

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

The Physiology of Human Brown Adipose Tissue

The Role of Proprioceptive Deficits, Psychosocial Factors and Inflammation in Pregnancy-related Pelvic Girdle Pain

Exercise and Protein Efficiency in T2D

Effects of White Button Mushroom on Inflammation in Obese Postmenopausal Women at High Risk of Breast Cancer

The Magnitude of Inter-limb Asymmetry and Its Assocation with Inter-limb Asymmetry in Distance Runners and Non-runners

Night Owl Metabolism

Neurobehavioural and Cognitive Changes in Cancer Cachexia (CANCOG)

Iron Absorption and Losses in Young South African Women Living Without and With Overweight and Obesity

The Role of Islet GLP-1 in the Pathogenesis of Prediabetes

Food (Poly)Phenol Metabotypes and Beta-cell Mass and Function.

Explore Other Categories

Weight Loss Clinical Trials
for Healthy Volunteers

Weight Loss Clinical Trials
for Healthy Volunteers