Under $500 Paid Clinical Trials
581 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 281–300 of 581 studies
Recruiting
Not Applicable
Non-invasive Ultrasonic Auricular Vagus Nerve Stimulation
Healthy Participants
University of Nottingham30 enrolled2 locationsNCT07283913
Recruiting
Not Applicable
Study of Student Flourishing
Healthy
Flourish Science, Inc.2,500 enrolled11 locationsNCT07259746
Recruiting
Not Applicable
Investigation of Inspiratory Muscle Training Applied at Different Intensities on Intercostal Muscle Oxygenation
Healthy
Kirsehir Ahi Evran Universitesi27 enrolled1 locationNCT07029074
Recruiting
Not Applicable
Improving Executive Control in Cognitively Healthy Older Adults: the MUltitasking STrategy (MUST) Study
Alzheimer's Disease (AD)Healthy Aging
Rutgers, The State University of New Jersey130 enrolled1 locationNCT06995638
Recruiting
Not Applicable
A Study for Imaging the Lower Gastrointestinal Tract Using a Retro-TCE Capsule
Lynch SyndromeHealthyInflammatory Bowel Diseases+1 more
Massachusetts General Hospital30 enrolled1 locationNCT07219537
Recruiting
Not Applicable
Early Stage of Alzheimer's and Parkinson's Diseases, HearIng Relevance (SAPHIR)
Healthy ParticipantsMild Cognitive Impairment (MCI) AmnesticParkinson Disease (PD)
Cilcare SAS309 enrolled4 locationsNCT07083089
Recruiting
Not Applicable
Resistance Training-induced Adaptations in Children
Healthy Participants
Brock University40 enrolled1 locationNCT07267429
Recruiting
Not Applicable
The Effect of α-GPC on Cognitive Function and Sports Performance
Healthy Participants
Nanjing Nutrabuilding Bio-tech Co., Ltd.80 enrolled1 locationNCT07267845
Recruiting
Not Applicable
Examining the Most Effective Method to Reduce Running Ground Contact Time
Healthy Runners
Keller Army Community Hospital30 enrolled1 locationNCT06988709
Recruiting
Not Applicable
Learning Cardiopulmonary Resuscitation in the School Setting: RCP-KNOW Project.
Cardiopulmonary resuscitation (CPR)Healthy ParticipantsChildren+2 more
University of Castilla-La Mancha550 enrolled2 locationsNCT07292532
Recruiting
Not Applicable
Impact of Native Chicory Inulin on Change and Persistence of Gut Microbiota
Healthy
Purdue University52 enrolled1 locationNCT06528041
Recruiting
Not Applicable
A Mobile App to Improve 24-Hour Movement Guideline Adherence in Preschoolers
Sedentary behaviorsHealth EducationSleep+10 more
University of Kansas Medical Center80 enrolled1 locationNCT06667661
Recruiting
Not Applicable
A Study on the Modulation of Gut Microbiota by Oral Sialic Acid in Healthy Subjects
HealthyTaking Sialic Acid to Regulate the Gut Microbiota
Xiaolong Li42 enrolled1 locationNCT07162662
Recruiting
Not Applicable
De-stressing the Brain: Can Eating Grapes During Periods of Mental Stress Protect Brain and Vascular Health in Young Adults
Healthy
University of Birmingham44 enrolled1 locationNCT06923722
Recruiting
Not Applicable
Examining Bronchial Hyperresponsiveness in Primary Ciliary Dyskinesia
HealthyPrimary Ciliary Dyskinesia
Indiana University40 enrolled1 locationNCT07288827
Recruiting
Not Applicable
Effects of PFC tDCS on Cognitive Control, Attention Lapses and Coordinated Neural Activity in the Theta and Alpha Bands
Healthy
University of California, Davis75 enrolled1 locationNCT04885322
Recruiting
Not Applicable
Interaction Between Dairy and Gut Hormone Response on Cognitive Performance in Children.
HealthyChildren
Toronto Metropolitan University48 enrolled1 locationNCT07231146
Recruiting
Not Applicable
"One All" to Get it RYT (Resilient Young Tribal Adults)
Youth Resiliencehealthy human volunteers
University of Pittsburgh240 enrolled2 locationsNCT06474260
Recruiting
Not Applicable
Socioeconomic Determinants of the Chemical Exposome and Its Genotoxic Effects in Children
Healthy Volunteer Children
Institut Cancerologie de l'Ouest140 enrolled1 locationNCT06314633
Recruiting
Not Applicable
Efficacy of Two HMOs in Chinese Infants
Healthy infants
Société des Produits Nestlé (SPN)262 enrolled1 locationNCT06361719