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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Vitamin Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Enhanced Natural Killer Cell Activity and RBAC

NCT02019628
View directory record Official record
Conditions
Family Member
Interventions
Rice Bran Arabinoxylan Compound (RBAC)
Dietary Supplement
Lead sponsor
University of Miami
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Oct 9, 2023 · Synced Sep 22, 2026, 3:41 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Bioavailability of Vitamin D(25(OH)D) and Omega-3 Fatty Acid (DHA) Enhanced Chicken

NCT05248737
View directory record Official record
Conditions
Nutrition, Healthy
Interventions
DHA/EPA fortified chicken plus Placebo, non-25(OH)D fortified chicken/eggs plus vitamin D3 supplement, non-DHA bio-enhanced chicken plus supplement DHA Omega-3, 25(OH)D bioenhanced chicken and eggs plus placebo, Dietary Supplement: DHA/EPA fortified eggs plus Placebo, non-DHA bio-enhanced eggs plus supplement DHA Omega-3, non-25(OH)D fortified chicken/eggs plus placebo
Dietary Supplement · Other
Lead sponsor
Cornell University
Other
Eligibility
18 Years to 35 Years
Enrollment
84 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Mar 31, 2026 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Vitamin D and Arterial Stiffness in Elderly

NCT03649802
View directory record Official record
Conditions
Vitamin D Deficiency, Arterial Stiffness
Interventions
Low dose vitamin D3, High dose vitamin D3
Dietary Supplement
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
65 Years to 89 Years
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Mar 20, 2022 · Synced Sep 22, 2026, 3:41 PM EDT
Completed No phase listed Observational

Vitamins, Breastmilk HIV Shedding, and Child Health

NCT00197756
View directory record Official record
Conditions
Maternal and Child Health Outcomes
Interventions
Vitamin A alone, Multivitamins excluding vitamin A, multivitamins including vitamin A, Placebo
Dietary Supplement · Other
Lead sponsor
Harvard School of Public Health (HSPH)
Other
Eligibility
18 Years and older · Female only
Enrollment
771 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2007
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 20, 2009 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Phase 1 Interventional

Effect of a Monthly High Dose of Vitamin D3 on Bariatric Surgery Patients

NCT02477956
View directory record Official record
Conditions
Morbid Obesity, Vitamin D Deficiency
Interventions
vitamin D3 (Replesta), vitamin D
Dietary Supplement
Lead sponsor
Texas Tech University
Other
Eligibility
18 Years to 60 Years
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Jun 22, 2015 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Phase 2Phase 3 Interventional

Vitamin D Supplementation for Extremely Preterm Infants

NCT01600430
View directory record Official record
Conditions
Vitamin D Deficiency, Preterm Infants, Bronchopulmonary Dysplasia
Interventions
Cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
1 Minute to 7 Days
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Feb 9, 2017 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

RiteStart Personal Nutritional Dietary Study

NCT05130905
View directory record Official record
Conditions
Healthy Nutrition
Interventions
RiteStart Supplement
Dietary Supplement
Lead sponsor
4Life Research, LLC
Industry
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Sandy City, Utah
Source: ClinicalTrials.gov public record
Updated Nov 22, 2021 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Phase 4 Interventional Results available

Pilot Study for Zoledronic Acid to Prevent Bone Loss After Bariatric Surgery

NCT03424239
View directory record Official record
Conditions
Bariatric Surgery Candidate
Interventions
Zoledronic Acid, Calcium citrate + vitamin D, Vitamin D3
Drug · Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
25 Years to 100 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 28, 2021 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Not applicable Interventional

Effectiveness of High Dose Vitamin D Supplementation in Stage III Colorectal Cancer

NCT02603757
View directory record Official record
Conditions
Colon Cancer, Rectal Cancer
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Legacy Health System
Other
Eligibility
18 Years to 99 Years
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
3
States / cities
Gresham, Oregon • Portland, Oregon • Tualatin, Oregon
Source: ClinicalTrials.gov public record
Updated Sep 30, 2020 · Synced Sep 22, 2026, 3:41 PM EDT
Not listed No phase listed Observational

Interconception Care at the University of Mississippi Medical Center

NCT03024385
View directory record Official record
Conditions
Maternal Behavior, Depression
Interventions
Well Child Visits
Behavioral
Lead sponsor
University of Mississippi Medical Center
Other
Eligibility
13 Years to 67 Years
Enrollment
1,625 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2026
U.S. locations
1
States / cities
Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Apr 26, 2020 · Synced Sep 22, 2026, 3:41 PM EDT
Terminated Phase 2 Interventional Results available

Vitamin D and n-3 Polyunsaturated Fatty Acids (PUFAs) to Prevent Chronic Pain Following Major Thermal Burn Injury

NCT03313076
View directory record Official record
Conditions
Chronic Pain Following Thermal Burn Injury
Interventions
Omega-3 fatty acids (fish oil), Vitamin D3 (cholecalciferol), Vitamin D3 (cholecalciferol) placebo, Omega-3 fatty acid placebo
Drug
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 65 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated May 7, 2026 · Synced Sep 22, 2026, 3:41 PM EDT
Recruiting Not applicable Interventional

Living Well With Lymphoma

NCT06047626
View directory record Official record
Conditions
Lymphoma
Interventions
Fatigue Reduction Diet, General Health Curriculum
Other
Lead sponsor
University of Michigan Rogel Cancer Center
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Oct 29, 2025 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Phase 2 Interventional

Calcitriol in Treating Patients With a Rising PSA Level Following Treatment for Prostate Cancer

NCT00004043
View directory record Official record
Conditions
Prostate Cancer
Interventions
calcitriol
Dietary Supplement
Lead sponsor
OHSU Knight Cancer Institute
Other
Eligibility
18 Years to 120 Years · Male only
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2003
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 27, 2017 · Synced Sep 22, 2026, 3:41 PM EDT
Recruiting Phase 4 Interventional

Aspirin and Hemocompatibility Events in Chronic Advanced Heart Failure Patients With Assist Device

NCT06655376
View directory record Official record
Conditions
Bleeding, Clot Blood
Interventions
Aspirin, Warfarin
Drug
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
128 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
3
States / cities
Chicago, Illinois • New York, New York • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Feb 26, 2026 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Not applicable Interventional

Vitamin D Therapy to Reduce Cardiac Damage Among Vulnerable Hypertensive Patients

NCT01360476
View directory record Official record
Conditions
Hypertension, Left Ventricular Hypertrophy
Interventions
cholecalciferol (Vitamin D), Placebo
Dietary Supplement
Lead sponsor
Wayne State University
Other
Eligibility
30 Years to 74 Years
Enrollment
354 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Dec 8, 2015 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Not applicable Interventional

Effects of Exercise in People With Paraplegia

NCT01203150
View directory record Official record
Conditions
Spinal Cord Injury
Interventions
Exercise
Other
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 65 Years
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Mar 23, 2015 · Synced Sep 22, 2026, 3:41 PM EDT
Active, not recruiting Not applicable Interventional

A 12-week Pilot Nutrition Intervention for Children With New Diagnosis of Stage 3 Type 1 Diabetes (T1D)

NCT06640478
View directory record Official record
Conditions
Type 1 Diabetes
Interventions
NUTRI-Beta Counseling, Standard dietary counseling, Free weekly produce foods
Other · Dietary Supplement
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
6 Years to 17 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
2
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 16, 2026 · Synced Sep 22, 2026, 3:41 PM EDT
Terminated Not applicable Interventional

A Pilot Study of High-Dose, Intravenous Ascorbic Acid (Vitamin C) to Treat Hepatitis C

NCT01250743
View directory record Official record
Conditions
Hepatitis C
Interventions
ascorbic acid (vitamin C)
Dietary Supplement
Lead sponsor
Health Innovations, Frontier Research Institute
Other
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Feb 17, 2011 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Phase 4 Interventional Results available

Vitamin D and Prebiotics for Intestinal Health in Cystic Fibrosis

NCT04118010
View directory record Official record
Conditions
Cystic Fibrosis, Dysbiosis
Interventions
Vitamin D3, Placebo vitamin D3, Inulin, Placebo Inulin
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Feb 6, 2024 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Phase 1 Interventional Results available

Vitamin D Supplementation in Crohn's Patients

NCT00742781
View directory record Official record
Conditions
Inflammatory Bowel Disease
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
Penn State University
Other
Eligibility
18 Years to 70 Years
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
2
States / cities
Hershey, Pennsylvania • University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 25, 2013 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Phase 1 Interventional

The Body's Affect on Vitamin C

NCT00001309
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Vitamin C
Other
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years to 35 Years
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1997 – 2019
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 7, 2026 · Synced Sep 22, 2026, 3:41 PM EDT
Active, not recruiting Not applicable Interventional

SIMPLAAFY Clinical Trial

NCT06521463
View directory record Official record
Conditions
Atrial Fibrillation, Stroke, Bleeding
Interventions
WATCHMAN FLX Pro LAAC Device
Device
Lead sponsor
Boston Scientific Corporation
Industry
Eligibility
18 Years and older
Enrollment
1,857 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
86
States / cities
Birmingham, Alabama • Phoenix, Arizona • Scottsdale, Arizona + 78 more
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Sep 22, 2026, 3:41 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Gender, Obesity, C-Reactive Protein, and Oxidative Stress

NCT00079963
View directory record Official record
Conditions
Cardiovascular Disease
Interventions
Vitamin C, Vitamin E, Placebo
Dietary Supplement
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years and older
Enrollment
396 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2008
U.S. locations
1
States / cities
Berkeley, California
Source: ClinicalTrials.gov public record
Updated Sep 26, 2017 · Synced Sep 22, 2026, 3:41 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 Sep 22, 2026, 3:41 PM EDT