Study type
Nutrition and metabolism studies recruiting now
Nutrition and metabolism studies look at diets, supplements, metabolic conditions and fatty liver disease. Some are run by universities with controlled meals.
361 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
Studies
- RecruitingHealthy volunteers
Effect of a Dietary Supplement Versus Placebo on Serum PFAS Levels in Male Firefighters
Cambiotics ApS
- Location
- Chicago, IL
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteers
Efficacy of Qualia Testosterone+ on Testosterone Levels in Adult Males
Qualia Life Sciences
- Location
- Carlsbad, CA
- Eligibility basics
- Ages 28–65 · Men only
- RecruitingHealthy volunteers
The Impact of Qualia Vitamin C+ on Individuals With Suboptimal and Adequate Vitamin C Levels
Qualia Life Sciences
- Location
- Carlsbad, CA
- Eligibility basics
- Ages 25–75
- RecruitingHealthy volunteers
The Effects of Daily Supplementation of a Soluble Fiber on the Fecal Microbiota in Volunteers.
Roquette Freres
- Location
- Addison, IL
- Eligibility basics
- Ages 18–60
- RecruitingHealthy volunteers
A Randomized Comparison of Stage-Based Care Versus Risk Factor-Based Care for Prevention of Cardiovascular Events
Cleerly, Inc.
- Location
- Chandler, AZ + 121 other US sites
- Eligibility basics
- Ages 55+
- RecruitingHealthy volunteers
Multi-strain Probiotic Supplement for Digestive Comfort and Well-being in Healthy Women
Daily Nouri
- Location
- San Francisco, CA
- Eligibility basics
- Ages 25–45 · Women only
- RecruitingHealthy volunteers
An Open-Label, Two-Arm Pilot Study of the Tolerability, Consumer Acceptability, and Exploratory Well-Being Outcomes of a Multi-Ingredient Protein Formula in Two Flavors in Healthy Adults
Qualia Life Sciences
- Location
- Carlsbad, CA
- Eligibility basics
- Ages 21–65
- RecruitingHealthy volunteers
Longevity Metrics AI/ML Development Study
Longevity Metrics, Inc.
- Location
- Boulder, CO
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
100-Year Human Aging Study
Longevity Metrics, Inc.
- Location
- Boulder, CO
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Human Observatory Study
Longevity Metrics, Inc.
- Location
- Boulder, CO
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Health Ahead Comparative Effectiveness Study
William Brandenburg, MD
- Location
- Boulder, CO
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Effects of Continuous Yogurt Intake on Immunomodulatory Function and Subjective Health Status in Healthy U.S. Adults
Meiji Co., Ltd.
- Location
- Chicago, IL
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Women's Hormonal and Metabolic Wellbeing Study
Daily Nouri
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Sleep More, Stress Less: 90-Day Trial of Neuralli Mood
Efforia, Inc
- Location
- New York, NY
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
iVS-1 Probiotic Intervention Targeting Biological Aging in Midlife Adults
Synbiotic Health
- Location
- New Port Richey, FL
- Eligibility basics
- Ages 40–75
- RecruitingHealthy volunteers
Rezdiffra Pregnancy and Lactation Registry
Madrigal Pharmaceuticals, Inc.
- Location
- West Conshohocken, PA
- Eligibility basics
- Any age listed · Women only
- RecruitingHealthy volunteers
Decentralized Study to Evaluate a Dietary Supplement for Episodes of Mild Acute Stress in Healthy People
PLT Health Solutions
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–60
- RecruitingHealthy volunteers
An Efficacy Study of a Dietary Supplement Drink Mix for Urinary Health Improvement
Bonafide Health
- Location
- Harrison, NY
- Eligibility basics
- Ages 18–75 · Women only
- RecruitingHealthy volunteers
Hunger Perception and Weight-Related Outcomes Following Use of a Leptin-Supporting Dietary Supplement
Efforia, Inc
- Location
- New York, NY
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Evaluation of Gut-Related Well-Being and Mood Effects of a Daily Nutritional Food Ingredient From the Co-Fermentation of Fungal Mycelium (Pleurotus Pulmonarius) and Microalgae (Chlorella Vulgaris)
Koralo GmbH
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
The Effects of a Nutritional Supplement on Sleep Quality
Athletic Greens International
- Location
- Santa Monica, CA
- Eligibility basics
- Ages 35–65
- RecruitingHealthy volunteers
Thermoacoustic Method for Estimating Liver Fat Fraction
Endra Lifesciences
- Location
- Ann Arbor, MI
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Development of a Quantifiable Ultrasound Biomarker for Hepatic Steatosis
ContextVision AB
- Location
- Seattle, WA
- Eligibility basics
- Ages 18–75
- RecruitingHealthy volunteers
Aimmune Longitudinal Collaboration Study
Aimmune Therapeutics, Inc.
- Location
- Ambler, PA + 1 other US site
- Eligibility basics
- Ages 18–50
Who these studies look for
Expect limits on supplements, alcohol and diet changes during the study, and sometimes a set BMI range.
Matching a page like this one never means you qualify. Each research team decides eligibility at screening.
Questions
Are meals provided in nutrition studies?
Sometimes. Controlled-feeding studies provide food; others ask you to follow a plan at home. The listing summary and the study team explain what is involved.