Nutrition & metabolism · California
Nutrition and metabolism studies in California
72 studies have at least one recruiting site in California. Nutrition and metabolism studies look at diets, supplements, metabolic conditions and fatty liver disease. Some are run by universities with controlled meals.
72 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
Studies
- RecruitingHealthy volunteers
UCLA Magnesium Formulation Athlete Study
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Nutrition for Precision Health, Powered by the All of Us
RTI International
- Location
- Davis, CA + 12 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 4
The Impact of Dietary Salt on the Severity of Eczema
University of California, San Francisco
- Location
- San Francisco, CA + 1 other US site
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 4
The Impact of Salt Intake on Sodium in the Skin and Inflammatory Skin Disease
University of California, San Francisco
- Location
- San Francisco, CA + 1 other US site
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Effects of Dietary Supplements on Muscle Mass and Function While Using GLP-1 Medication
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Diet Quality Pilot Intervention in LA Safety Net
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Measurement and Determinants of Diet Quality in Older Adults
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 60+
- RecruitingHealthy volunteers
Irritable Bowel Syndrome and Control Volunteers: Diet Challenge
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–75
- RecruitingHealthy volunteers
The Influence of Chardonnay Marc Intake on Gut and Cardiometabolic Health
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 45–70 · Women only
- RecruitingHealthy volunteers
Developing a Nutritional Supplement to Increase Collagen Synthesis in People
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteers
Multivitamin and Mineral Supplementation and Healthy Aging
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 40–60
- RecruitingHealthy volunteers
Polyphenols and Cognitive Decline
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 50+
- RecruitingHealthy volunteers
Intermittent Fasting on Body Fat and Quality of Life
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Efficacy and Safety of Shatavari Root Extract in Women's Sexual Wellness
SF Research Institute, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 20–50 · Women only
- RecruitingHealthy volunteers
Ketogenic Diet and Brain Response in Anorexia Nervosa
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Insomnia Treatment and Cardiometabolic Health in Older Adults With Posttraumatic Stress Disorder
University of California, Los Angeles
- Location
- North Hills, CA
- Eligibility basics
- Ages 50+
- RecruitingHealthy volunteers
Prebiotic Effects of California Grapes on Gut Health and Cardiometabolic Health in Overweight Men and Women
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 45–70
- RecruitingHealthy volunteers
Sleep Well Firefighters: An App-based Program to Improve Sleep, Cognition, and Behavioral Health in Firefighters
California Polytechnic State University-San Luis Obispo
- Location
- San Luis Obispo, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
An 8-Week Study Evaluating Gut and Digestive Health After Use of a Dietary Supplement System
SF Research Institute, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteers
Effects of Daily Beef Intake, as a Component of a Heart-Healthy Diet on Cellular Zinc
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 55–70
- RecruitingHealthy volunteers
A Study of a Dietary Supplement on Serum Biomarkers in Children
SF Research Institute, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 4–15
- RecruitingHealthy volunteersPhase 2
Implementing Food Referrals for Equity and Sustained Health
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 5+
- RecruitingHealthy volunteersPhase 3
Food Prescriptions to Promote Affordable Diets
Kaiser Permanente
- Location
- Pasadena, CA
- Eligibility basics
- Ages 2+
- RecruitingHealthy volunteers
Longitudinal Multi-Omic Profiles to Reveal Mechanisms of Obesity-Mediated Insulin Resistance
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 35–65
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.