Under $500 Paid Clinical Trials
580 studies
Dietary, survey, and observational studies typically compensate under $500 per participant.
Compensation amounts shown are typical ranges for this study type — not guaranteed amounts. Actual compensation is set by each study sponsor and documented in the informed consent form. ClinicalTrials.gov does not include a structured compensation field.
Showing 1–20 of 580 studies
Recruiting
Not Applicable
Interactive Effects of Sodium and Potassium on Vascular Health in Older Adults
Healthy Older Adults
Florida State University30 enrolled1 locationNCT07649005
Recruiting
Not Applicable
Effects of Urolithin A Supplementation on Glucose Metabolism in Healthy Adults 55 >= Years Old: A Randomized Triple-Masked Controlled Clinical Trial
Healthy Volunteer
National Institute on Aging (NIA)180 enrolled1 locationNCT06274749
Recruiting
Not Applicable
Variability In Mixed Meal Tests: Fixed Versus Adjusted to Energy Needs Caloric Dose
ObesityHealthy Volunteer
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)79 enrolled1 locationNCT06223555
Recruiting
Not Applicable
Imaging of Electrical Properties by MRI: Investigation of Age-Related Changes
Healthy Subjects
Central Hospital, Nancy, France120 enrolled2 locationsNCT07415759
Recruiting
Not Applicable
The Effects of Increasing Caloric Intake on Diet-Induced Thermogenesis and 24h Energy Expenditure
ObesityHealthy VolunteersNormal Physiology
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)120 enrolled1 locationNCT05545306
Recruiting
Not Applicable
The SEAS Study: Sensory Engagement and Activation During Noninvasive Stimulation
healthy adult participants
University of Minnesota40 enrolled3 locationsNCT07606573
Recruiting
Not Applicable
Mechanism of Non-invasive Magnetic Stimulation
Healthy Volunteers
National Institute on Drug Abuse (NIDA)70 enrolled1 locationNCT03394066
Recruiting
Not Applicable
Location- and Frequency-Dependent Effects of Thalamic Temporal Interference Stimulation During Sleep
healthy adult participantsHealthy Participants
University of Wisconsin, Madison24 enrolled1 locationNCT07498270
Recruiting
Not Applicable
The Breakfast Study: How Different Aspects of Food Affect Eating
Healthy Individuals
USDA Grand Forks Human Nutrition Research Center40 enrolled1 locationNCT07525050
Recruiting
Not Applicable
Generalization and Specificity of Visual Learning During Sleep
Healthy VolunteersVisual Learning
Brown University10 enrolled1 locationNCT07015840
Recruiting
Not Applicable
Personalized Health Self-Management Training for Colorectal Cancer Survivors
Colorectal, CancerGastrointestinal CancersHealth Behavior+2 more
University of Southern California120 enrolled2 locationsNCT05984589
Recruiting
Not Applicable
Multivitamin and Mineral Supplementation and Healthy Aging
Healthy AgingMultivitamin and Mineral Supplementation
University of California, San Diego150 enrolled1 locationNCT07642869
Recruiting
Not Applicable
Feasibility and Acceptability of Mindful Self-Compassion Among Transgender and Nonbinary Young Adults
Healthy
University of Rhode Island50 enrolled1 locationNCT06409975
Recruiting
Not Applicable
Neurobehavioral Signatures of Sign- and Goal-Tracking in Emerging Adults: Translation of a Preclinical Model
HealthySubstance Use
University of Michigan294 enrolled2 locationsNCT07094061
Recruiting
Not Applicable
The Effect of Consumed Berries on Extracellular Vesicle Signalling in the Body
HealthyExtracellular Vesicles
University of Oulu60 enrolled1 locationNCT07381933
Recruiting
Not Applicable
Development of Magnetic Resonance Spectroscopic Imaging Techniques for Imaging Metabolites in Human Brain and Muscle
Healthy VolunteerBrain Mapping
National Institute of Mental Health (NIMH)300 enrolled1 locationNCT01266577
Recruiting
Not Applicable
Sociocultural & Biobehavioral Influences on Pain Expression and Assessment
PainHealthy VolunteersNormal Physiology
National Center for Complementary and Integrative Health (NCCIH)700 enrolled1 locationNCT03258580
Recruiting
Not Applicable
Impact of Heat on Dual Task Performance
HealthyHeat Stress, Exertional
Louisiana State University Health Sciences Center Shreveport10 enrolled1 locationNCT07629414
Recruiting
Not Applicable
New Heart Imaging Techniques to Evaluate Possible Heart Disease
ObesityHealthyDiabetes+2 more
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)4,000 enrolled1 locationNCT01399385
Recruiting
Not Applicable
Tocotrienol Supplementa as A Senolytic Agent in Middle-aged Adults
Healthy
National University of Malaysia220 enrolled1 locationNCT07637487
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