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Showing 1–24 of 634 matching trials from the live ClinicalTrials.gov search.
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Completed Phase 1Phase 2 Interventional

The Effect of Oral Niacinamide on Plasma Phosphorus Levels in Peritoneal Dialysis Patients

NCT00508885
View directory record Official record
Conditions
Hyperphosphatemia
Interventions
Niacinamide, Placebo
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
17 participants
Timeline
2006 – 2007
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 29, 2007 · Synced Jul 21, 2026, 9:50 PM EDT
Completed Not applicable Interventional

The Produce Drop: Using Food as Medicine to Lower A1C Levels and Blood Pressure

NCT04421755
View directory record Official record
Conditions
Diabetes, Hypertension, Nutrition Poor
Interventions
Produce delivery, Cooking classes
Other
Lead sponsor
University of Oklahoma
Other
Eligibility
18 Years to 64 Years
Enrollment
85 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Tulsa, Oklahoma
Source: ClinicalTrials.gov public record
Updated Jan 9, 2023 · Synced Jul 21, 2026, 9:50 PM EDT
Completed Not applicable Interventional

School Breakfast Policy Initiative Study

NCT01924130
View directory record Official record
Conditions
Childhood Obesity, Hunger
Interventions
Classroom feeding, Nutrition education lessons, Social Marketing, Parent outreach
Other · Behavioral
Lead sponsor
Temple University
Other
Eligibility
7 Years to 16 Years
Enrollment
2,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 29, 2016 · Synced Jul 21, 2026, 9:50 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Environmental Influences on Vitamin D Status

NCT00780247
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
Creighton University
Other
Eligibility
18 Years to 60 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Anchorage, Alaska
Source: ClinicalTrials.gov public record
Updated Oct 26, 2008 · Synced Jul 21, 2026, 9:50 PM EDT
Completed Not applicable Interventional Results available

The Effect of Hypovitaminosis D and Vitamin D Supplementation on Fracture Nonunion Rates

NCT01691833
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
113 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 13, 2022 · Synced Jul 21, 2026, 9:50 PM EDT
Terminated No phase listed Observational

Asthma, Missed Immunizations, and Vitamin D Deficiency in Atopic Dermatitis

NCT01234909
View directory record Official record
Conditions
Atopic Dermatitis, Vitamin D Deficiency, Asthma
Interventions
Not listed
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
1 Year to 18 Years
Enrollment
98 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated May 31, 2015 · Synced Jul 21, 2026, 9:50 PM EDT
Completed No phase listed Observational

Low Dose Vitamin C in Burns >20% Compared to Previous Studies With High Dose Vitamin C

NCT05612867
View directory record Official record
Conditions
Burns, Ascorbic Acid Deficiency, Burn Shock, Burn Degree Second, Burn Degree Third, Fluid and Electrolyte Imbalance
Interventions
Vitamin C
Dietary Supplement
Lead sponsor
Arrowhead Regional Medical Center
Other
Eligibility
Not listed
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Colton, California
Source: ClinicalTrials.gov public record
Updated Nov 9, 2022 · Synced Jul 21, 2026, 9:50 PM EDT
Completed Not applicable Interventional

Vitamin D and Microbiota in Cystic Fibrosis

NCT02589444
View directory record Official record
Conditions
Vitamin D Deficiency, Cystic Fibrosis
Interventions
High-Dose Vitamin D3, Stool Sample, Sputum Sample, Sham Comparator, Blood draw
Dietary Supplement · Other · Procedure
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 13, 2017 · Synced Jul 21, 2026, 9:50 PM EDT
Completed No phase listed Observational

Renal Osteodystrophy: A Fresh Approach

NCT00859612
View directory record Official record
Conditions
Renal Osteodystrophy
Interventions
Not listed
Lead sponsor
Hartmut Malluche, MD
Other
Eligibility
18 Years and older
Enrollment
464 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated May 4, 2017 · Synced Jul 21, 2026, 9:50 PM EDT
Completed No phase listed Observational

Laparoscopic Revision From Biliopancreatic Diversion to Gastric Bypass

NCT01041456
View directory record Official record
Conditions
Metabolic and Nutritional Complications, Protein Malnutrition, Intestinal Malabsorptive Syndrome, Metabolic Bone Disease
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Fresno, California
Source: ClinicalTrials.gov public record
Updated Dec 31, 2009 · Synced Jul 21, 2026, 9:50 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Vitamin D and Functional Outcomes After Total Hip Arthroplasty (THA)

NCT01397383
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
Hospital for Special Surgery, New York
Other
Eligibility
40 Years and older
Enrollment
219 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2014
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 19, 2017 · Synced Jul 21, 2026, 9:50 PM EDT
Completed Not applicable Interventional

Home Parenteral Nutrition (HPN) Families' Mobile Distance Connections to Care Research

NCT01900288
View directory record Official record
Conditions
Short Bowel Syndrome, Malabsorption, Malnutrition
Interventions
HPN Group Clinic Appointments using Mobile Devices (experimental), Mobile Device Access (placebo)
Behavioral
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
13 Years and older
Enrollment
121 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Jan 26, 2017 · Synced Jul 21, 2026, 9:50 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Pilot Study: The Effect of Ergocalciferol on Plasma Mucin-1 Levels

NCT03747523
View directory record Official record
Conditions
Ergocalciferol
Interventions
Ergocalciferol
Drug
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 65 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 28, 2020 · Synced Jul 21, 2026, 9:50 PM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Autoantibodies to Gastric Parietal Cells in Rheumatoid Arthritis Patients

NCT01876329
View directory record Official record
Conditions
Vitamin B12 Deficiency
Interventions
Not listed
Lead sponsor
Keesler Air Force Base Medical Center
Federal
Eligibility
18 Years and older
Enrollment
125 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Keesler Air Force Base, Mississippi
Source: ClinicalTrials.gov public record
Updated May 28, 2015 · Synced Jul 21, 2026, 9:50 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Obesity Prevention in Head Start

NCT03672227
View directory record Official record
Conditions
Childhood Obesity
Interventions
Mealtime Matters Training
Behavioral
Lead sponsor
University of Michigan
Other
Eligibility
Not listed
Enrollment
164 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Jan 9, 2022 · Synced Jul 21, 2026, 9:50 PM EDT
Recruiting Not applicable Interventional

Copper Supplementation in Cirrhosis

NCT07471542
View directory record Official record
Conditions
Cirrhosis, Chronic Liver Disease, Fibrosis, Infection
Interventions
Copper Gluconate
Dietary Supplement
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Mar 12, 2026 · Synced Jul 21, 2026, 9:50 PM EDT
Completed Not applicable Interventional

Iron Therapy for Autosomal Dominant Hypophosphatemic Rickets: A Pilot Project.

NCT02233322
View directory record Official record
Conditions
Autosomal Dominant Hypophosphatemic Rickets
Interventions
Iron
Dietary Supplement
Lead sponsor
Indiana University
Other
Eligibility
25 Months and older
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Nov 13, 2019 · Synced Jul 21, 2026, 9:50 PM EDT
Terminated Not applicable Interventional Results available

Vitamin D Supplementation Requirement in Obese Subjects

NCT00996866
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D3, placebo
Drug
Lead sponsor
Winthrop University Hospital
Other
Eligibility
18 Years to 70 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Jul 2, 2023 · Synced Jul 21, 2026, 9:50 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin B6 Dependence of One-Carbon Metabolism

NCT00877812
View directory record Official record
Conditions
Vitamin B6 Deficiency
Interventions
Arm 1 glycine and leucine, Arm 2 Intervention of Serine and methionine infusion
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
20 Years to 40 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Mar 26, 2013 · Synced Jul 21, 2026, 9:50 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Preeclampsia Research on Vitamin D, Inflammation, & Depression

NCT03018132
View directory record Official record
Conditions
Pre-Eclampsia, Depression, Inflammation, Vitamin D Deficiency
Interventions
mental health screening, education and referral program
Other
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2025
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Feb 6, 2024 · Synced Jul 21, 2026, 9:50 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Effect of Vitamin D Supplementation on Endothelial Function in Obese Adolescents

NCT01746264
View directory record Official record
Conditions
Obesity, Endothelial Dysfunction, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
12 Years to 18 Years
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 1, 2016 · Synced Jul 21, 2026, 9:50 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Upgrade the Grains Study: Increasing Whole Grain Consumption in Low-income Children With Obesity

NCT02719730
View directory record Official record
Conditions
Obesity
Interventions
Reimbursement for whole grain purchases
Behavioral
Lead sponsor
UCSF Benioff Children's Hospital Oakland
Other
Eligibility
8 Years to 16 Years
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
1
States / cities
Oakland, California
Source: ClinicalTrials.gov public record
Updated Feb 12, 2018 · Synced Jul 21, 2026, 9:50 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluating Use of a Farmers Market Incentive Program Among Low-Income Health Center Patients

NCT02558660
View directory record Official record
Conditions
Food Insecurity, Non-use of Existing State-wide SNAP Incentive Program
Interventions
Education, voucher
Behavioral
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
177 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Ypsilanti, Michigan
Source: ClinicalTrials.gov public record
Updated Dec 27, 2015 · Synced Jul 21, 2026, 9:50 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Environmental & Genetic Influences on Vitamin D Status

NCT01208636
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
Creighton University
Other
Eligibility
18 Years to 60 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Sep 23, 2010 · Synced Jul 21, 2026, 9:50 PM EDT