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ClinicalTrials.gov public records Last synced Oct 15, 2026, 2:16 PM EDT

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Showing 409–432 of 550 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: vitamin D3 (Replesta) Clear all
Recruiting Phase 2 Interventional

Influence of β-hydroxy β-methyl Butyrate (HMB)Supplementation on Post-operative Muscle Mass and Function in Female Athletes

NCT05869812
View directory record Official record
Conditions
Atrophy
Interventions
CaHMB (Dietary supplement, not Drug), CaLa
Drug · Dietary Supplement
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
1
States / cities
Overland Park, Kansas
Source: ClinicalTrials.gov public record
Updated Mar 2, 2026 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Phase 1 Interventional

Trial of Combination Therapy to Treat COVID-19 Infection

NCT04482686
View directory record Official record
Conditions
COVID, Covid-19, Corona Virus Infection, Coronavirus Infection, Coronavirus-19, SARS-CoV2, SARS-CoV Infection
Interventions
Ivermectin, Doxycycline Hcl, Zinc, Vitamin D3, Vitamin C
Drug · Dietary Supplement
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Years and older
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Sep 24, 2024 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Can Vitamin D Reduce the Burden of COVID-19?

NCT07128069
View directory record Official record
Conditions
COVID-19
Interventions
Vitamin D 400IU, Vitamin D 4000IU
Dietary Supplement
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
2,093 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2025
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 7, 2026 · Synced Oct 15, 2026, 2:16 PM EDT
Completed No phase listed Observational

Vitamin D3 Supplementation in Pediatric IBD: Weely vs Daily Dosing Regimens

NCT02256605
View directory record Official record
Conditions
Inflammatory Bowel Disease (IBD)
Interventions
Vitamin D-3
Dietary Supplement
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
5 Years to 17 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated May 29, 2015 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Absorbance Study - Clinical Trial of the Absorbance of Nano Liquid D3

NCT04885803
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Softgel Vitamin D3, Nano Liquid Vitamin D3, 25(OH)D Blood Serum Test, Placebo Control
Dietary Supplement · Diagnostic Test · Other
Lead sponsor
Inspired Life Medical, Inc.
Industry
Eligibility
18 Years to 70 Years
Enrollment
114 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Le Sueur, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 24, 2021 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Phase 3 Interventional Results available

Effects of Vitamin D and Fish Oil on the Kidney in Hypertensives

NCT02757872
View directory record Official record
Conditions
Hypertension, Kidney Diseases
Interventions
Vitamin D3, Omega-3 Fatty acids, Vitamin D3 placebo, Fish oil placebo
Dietary Supplement · Drug
Lead sponsor
Albert Einstein College of Medicine
Other
Eligibility
50 Years to 99 Years
Enrollment
2,232 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 31, 2024 · Synced Oct 15, 2026, 2:16 PM EDT
Recruiting Not applicable Interventional

Preserving Physical Function in Older Adults With Cancer: Impact of an Optimizing Nutrition Intervention Applied Before and After Surgery

NCT05912257
View directory record Official record
Conditions
Cancer
Interventions
Structured perioperative nutrition and exercise, Nutrition and Exercise Counseling
Behavioral
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
55 Years and older
Enrollment
188 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated May 20, 2026 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Phase 2 Interventional Results available

Safety and Efficacy of Alendronate (Fosamax) in Children With Osteoporosis

NCT00259857
View directory record Official record
Conditions
Osteoporosis
Interventions
Alendronate
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
5 Years to 15 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2009
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jan 19, 2011 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Phase 2 Interventional Results available

Vitamin D in Ventilated ICU Patients

NCT01372995
View directory record Official record
Conditions
Respiratory Failure
Interventions
Enteral Vitamin D3 50,000 IU, Enteral Vitamin D3 100,000IU, Inactive substance
Drug · Other
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
2
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jan 9, 2017 · Synced Oct 15, 2026, 2:16 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

A Study of Changes in Bone Mineral Density as a Function of Consuming Two Different Forms of Calcium Carbonate

NCT01857154
View directory record Official record
Conditions
Osteopenia, Osteoporosis
Interventions
Micronized Calcium Carbonate, Non-Micronized Calcium Carbonate, Vitamin D3
Dietary Supplement
Lead sponsor
Integrative Health Technologies, Inc.
Network
Eligibility
21 Years and older
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Nov 25, 2013 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Phase 4 Interventional Results available

Vitamin D Repletion in Primary Hyperparathyroidism

NCT01306656
View directory record Official record
Conditions
Primary Hyperparathyroidism, Vitamin D Deficiency
Interventions
10,000 IU Vitamin D3, Placebo, Vitamin D
Drug · Other · Dietary Supplement
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 16, 2019 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Optimizing Vitamin D Status During Initial Military Training

NCT01617109
View directory record Official record
Conditions
Bone Health, Nutrition Status
Interventions
Ca/Vit D, Placebo
Dietary Supplement · Other
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
17 Years to 42 Years
Enrollment
342 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2018
U.S. locations
2
States / cities
Fort Sill, Oklahoma • San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Oct 11, 2018 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Bioequivalence Study on Vitamin D in Healthy Adults

NCT03552653
View directory record Official record
Conditions
Measure Absorption of Vitamin D in Blood
Interventions
Vitafusion Extra Strength Vitamin D
Dietary Supplement
Lead sponsor
Church & Dwight Company, Inc.
Industry
Eligibility
18 Years to 45 Years
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Princeton, New Jersey
Source: ClinicalTrials.gov public record
Updated Jun 12, 2018 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Not applicable Interventional

Role of Vitamin D in Secondary Prevention of Cardiovascular Events

NCT01018849
View directory record Official record
Conditions
Cardiovascular Disease
Interventions
Cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
Creighton University
Other
Eligibility
19 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
2
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Jan 15, 2016 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers

Clinical Trial of Vitamin D3 to Reduce Cancer Risk in Postmenopausal Women

NCT01052051
View directory record Official record
Conditions
Cancer
Interventions
Vitamin D3, Calcium carbonate
Dietary Supplement
Lead sponsor
Creighton University
Other
Eligibility
55 Years and older · Female only
Enrollment
2,303 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2015
U.S. locations
1
States / cities
Fremont, Nebraska
Source: ClinicalTrials.gov public record
Updated Jul 24, 2019 · Synced Oct 15, 2026, 2:16 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 14, 2017 · Synced Oct 15, 2026, 2:16 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin D Metabolism in Chronic Kidney Disease Patients

NCT01528176
View directory record Official record
Conditions
Vitamin D Metabolism is in Chronic Kidney Disease
Interventions
10,000 IU of cholecalciferol for a total of 8 weeks
Drug
Lead sponsor
Memphis VA Medical Center
Federal
Eligibility
18 Years to 85 Years · Male only
Enrollment
70 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Feb 14, 2012 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Phase 3 Interventional Results available

Study of the Effect of Vitamin D as an Add-on Therapy to Corticosteroids in Asthma

NCT01248065
View directory record Official record
Conditions
Asthma
Interventions
Vitamin D3, Ciclesonide
Drug
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
18 Years and older
Enrollment
408 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
16
States / cities
San Francisco, California • Denver, Colorado • Atlanta, Georgia + 10 more
Source: ClinicalTrials.gov public record
Updated Aug 13, 2014 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Ergogenic Effects of Sportlegs

NCT06371521
View directory record Official record
Conditions
Performance Enhancing Product Use
Interventions
Sportlegs, Placebo
Dietary Supplement
Lead sponsor
Christopher Bell
Other
Eligibility
18 Years to 30 Years
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 12, 2024 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Improving the Understanding of the Response to Vitamin D Supplementation

NCT01465178
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
50 Years to 100 Years · Female only
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 25, 2016 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Phase 2Phase 3 Interventional

The Effect of Vitamin D and Calcium on Bone in Pediatric HIV

NCT00724178
View directory record Official record
Conditions
HIV Infection, Bone Mass
Interventions
cholecalciferol plus calcium carbonate
Dietary Supplement
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
6 Years to 16 Years
Enrollment
59 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2006
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 15, 2010 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Phase 4 Interventional Results available

Wheezing in Black Preterm Infants: Impact of Vitamin D Supplementation Strategy

NCT01601847
View directory record Official record
Conditions
Wheezing, Allergy
Interventions
Cholecalciferol, Cholecalciferol
Dietary Supplement · Drug
Lead sponsor
Case Western Reserve University
Other
Eligibility
Up to 1 Year
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
5
States / cities
New York, New York • Cleveland, Ohio • Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 8, 2018 · Synced Oct 15, 2026, 2:16 PM EDT
Completed Not applicable Interventional Results available

Vitamin D Supplementation Reduces Renin-Angiotensin System Activity in Obesity

NCT01068418
View directory record Official record
Conditions
Obesity, Vitamin D Deficiency, Hypertension
Interventions
Vitamin D (cholecalciferol)
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 64 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 30, 2017 · Synced Oct 15, 2026, 2:16 PM EDT
Withdrawn Not applicable Interventional

Vitamin D Supplementation in Chronic Rhinosinusitis With Nasal Polyps

NCT01185808
View directory record Official record
Conditions
Chronic Sinusitis
Interventions
Vitamin D
Biological
Lead sponsor
Medical University of South Carolina
Other
Eligibility
14 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated May 1, 2018 · Synced Oct 15, 2026, 2:16 PM EDT