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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Cholecalciferol Capsules Clear all
Active, not recruiting Phase 3 Interventional Accepts healthy volunteers Results available

Vitamin D and Omega-3 Trial (VITAL)

NCT01169259
View directory record Official record
Conditions
Cancer, Cardiovascular Disease
Interventions
vitamin D3, omega-3 fatty acids (fish oil), Vitamin D3 placebo, Fish oil placebo
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
25,871 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 29, 2026 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Phase 2 Interventional Results available

The Effect of Paricalcitol Capsules on Reducing Albuminuria in Patients With Type 2 Diabetic Nephropathy Being Treated With Renin-angiotensin System Inhibitors

NCT00421733
View directory record Official record
Conditions
Diabetic Nephropathy, Chronic Kidney Disease
Interventions
Zemplar (paricalcitol) capsules, Placebo
Drug
Lead sponsor
Abbott
Industry
Eligibility
20 Years and older
Enrollment
281 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
27
States / cities
Phoenix, Arizona • Fountain Valley, California • Yuba City, California + 21 more
Source: ClinicalTrials.gov public record
Updated Jan 19, 2012 · Synced Sep 27, 2026, 10:46 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers Results available

Age-related Macular Degeneration (AMD) in the Vitamin D and Omega-3 Trial (VITAL)

NCT01782352
View directory record Official record
Conditions
Age-related Macular Degeneration
Interventions
Omega-3 fatty acids (fish oil), Vitamin D3, Vitamin D3 placebo, Fish oil placebo
Drug · Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
25,871 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2024
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 7, 2023 · Synced Sep 27, 2026, 10:46 AM EDT
Completed No phase listed Observational

Identification of Markers for Determining the Efficacy of Vitamin D Receptor Activator Therapy in Stage 3/4 CKD Patients

NCT02018133
View directory record Official record
Conditions
CKD Stage 3/4
Interventions
Vitamin D 2mg daily for 2 weeks oral paricalcitol, Placebo
Drug
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
18 Years and older
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 16, 2020 · Synced Sep 27, 2026, 10:46 AM 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 24, 2016 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Not applicable Interventional

Vitamin D Reabsorption in Adolescents and Young Adults With HIV Infection

NCT00490412
View directory record Official record
Conditions
HIV Infections
Interventions
Vitamin D supplement, Placebo
Dietary Supplement · Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 24 Years
Enrollment
207 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
14
States / cities
Los Angeles, California • San Francisco, California • Washington D.C., District of Columbia + 10 more
Source: ClinicalTrials.gov public record
Updated Feb 27, 2017 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Not applicable Interventional Results available

Cholecalciferol Versus Doxercalciferol in the Treatment of Secondary Hyperparathyroidism in Chronic Kidney Disease

NCT00285467
View directory record Official record
Conditions
Renal Osteodystrophy
Interventions
doxercalciferol, Cholecalciferol
Drug
Lead sponsor
Indiana University
Other
Eligibility
18 Years to 82 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated May 1, 2016 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Phase 1 Interventional

Effects of Treating Vitamin D Deficiency in Poorly Controlled Type 2 Diabetes

NCT01855321
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
Vitamin D, Placebo
Drug
Lead sponsor
University of Florida
Other
Eligibility
30 Years to 65 Years
Enrollment
76 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jun 25, 2015 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Not applicable Interventional Results available

Effect of Vitamin D Supplementation on Inflammation and Cardiometabolic Risk Factors in Obese Adolescents

NCT01217840
View directory record Official record
Conditions
Obesity
Interventions
Drisdol (Ergocalciferol) Vitamin D2, Placebo
Drug
Lead sponsor
Stanford University
Other
Eligibility
11 Years to 17 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Nov 28, 2017 · Synced Sep 27, 2026, 10:46 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Acute Vitamin D Supplementation on Testosterone in Females

NCT06610968
View directory record Official record
Conditions
Female Hormone Profile
Interventions
Vitamin D (Cholecalciferol ), Placebo Group
Dietary Supplement
Lead sponsor
University of Southern California
Other
Eligibility
18 Years to 35 Years · Female only
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 24, 2026 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Availability of Vitamin D in Orange Juice

NCT01778114
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D2 in orange juice, Vitamin D3 in orange juice, Vitamin D2, Vitamin D3, Placebo
Dietary Supplement · Other
Lead sponsor
Boston University
Other
Eligibility
18 Years and older
Enrollment
86 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2007
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 28, 2017 · Synced Sep 27, 2026, 10:46 AM 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 24, 2013 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Vitamin D as a Therapeutic Adjunct in the Stimulant Treatment of ADHD

NCT03103750
View directory record Official record
Conditions
ADHD
Interventions
Magnetic Resonance Imaging (MRI), PHNO, calcitriol, Placebo oral capsule, high-resolution research tomography, Dextro Amphetamine
Procedure · Drug · Dietary Supplement
Lead sponsor
Yale University
Other
Eligibility
18 Years to 50 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2023
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 18, 2024 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D Dose Finding Study

NCT01092338
View directory record Official record
Conditions
HIV Infections, AIDS
Interventions
Cholecalciferol (Vit D3)
Drug
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
5 Years to 24 Years
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 17, 2013 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Investigation of the Effect of BONISTEIN(R) Bone Blend on Bone Mineral Density/Content and Biomarkers of Bone Health

NCT00698984
View directory record Official record
Conditions
Osteoporosis
Interventions
BONISTEIN(R) bone blend, Placebo
Dietary Supplement
Lead sponsor
dsm-firmenich Switzerland AG
Industry
Eligibility
45 Years to 55 Years · Female only
Enrollment
70 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Jan 15, 2009 · Synced Sep 27, 2026, 10:46 AM EDT
Active, not recruiting Not applicable Interventional

VITamin D and OmegA-3 TriaL: Interrelationship of Vitamin D and Vitamin K on Bone (VITAL)

NCT04573946
View directory record Official record
Conditions
Bone Density, Bone Health, Fractures
Interventions
Vitamin D3 placebo, Fish oil placebo, Omega-3 fatty acids (fish oil), Vitamin D3
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
25,871 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 26, 2026 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

25-Hydroxyvitamin D Pharmacokinetic Study

NCT03401541
View directory record Official record
Conditions
Vitamin D Deficiency, Fat Malabsorption
Interventions
Calcifediol, Calciferol
Drug
Lead sponsor
Boston University
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 3, 2020 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Changes in Biomarkers Using Prostaglandin Inhibitors

NCT01769625
View directory record Official record
Conditions
Biomarker Change Linked to Breast Cancer
Interventions
placebo/celecoxib 400 mg and cholecalciferol 400 IU/cholecalciferol 2,000 IU
Drug
Lead sponsor
Hartford Hospital
Other
Eligibility
18 Years and older · Female only
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2016
U.S. locations
1
States / cities
Grand Forks, North Dakota
Source: ClinicalTrials.gov public record
Updated Aug 8, 2017 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Phase 4 Interventional Results available

Repeated-dose Safety, Efficacy, Pharmacokinetic and Pharmacodynamic of CTAP101, Immediate-release Calcifediol, High-dose Cholecalciferol, and Paricalcitol Plus Low-dose Cholecalciferol in Patients With Secondary Hyperparathyroidism, Chronic Kidney Disease 3-4 and Vitamin D Insufficiency

NCT03588884
View directory record Official record
Conditions
Secondary Hyperparathyroidism Due to Renal Causes, Vitamin D Insufficiency, CKD Stage 3, CKD Stage 4
Interventions
Calcifediol Oral Capsule, Calcifediol Oral Product, Cholecalciferol, Paricalcitol Oral Capsule
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
18 Years and older
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
3
States / cities
Garden Grove, California • Chicago, Illinois • West Bend, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 8, 2022 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin D on 25-hydroxyvitamin D Levels and Physical Function

NCT02293187
View directory record Official record
Conditions
Vitamin D Deficiency, Sarcopenia
Interventions
vitamin D3, Placebo
Dietary Supplement · Other
Lead sponsor
Tufts University
Other
Eligibility
60 Years to 85 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 20, 2019 · Synced Sep 27, 2026, 10:46 AM EDT
Terminated Phase 3 Interventional Results available

Efficacy and Safety of Cinacalcet in Pediatric Patients With Secondary Hyperparathyroidism (SHPT) and Chronic Kidney Disease (CKD) on Dialysis

NCT02138838
View directory record Official record
Conditions
Chronic Kidney Disease, Secondary Hyperparathyroidism
Interventions
Cinacalcet HCl, Standard of Care
Drug · Dietary Supplement
Lead sponsor
Amgen
Industry
Eligibility
6 Years to 17 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
26
States / cities
Los Angeles, California • Wilmington, Delaware • Atlanta, Georgia + 22 more
Source: ClinicalTrials.gov public record
Updated Jun 28, 2020 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Not applicable Interventional Results available

Vitamin D and Omega-3 Trial to Prevent and Treat Diabetic Kidney Disease

NCT01684722
View directory record Official record
Conditions
Diabetes
Interventions
Vitamin D, Omega-3 fatty acids (fish oil), Vitamin D placebo, Fish oil placebo
Dietary Supplement · Drug
Lead sponsor
University of Washington
Other
Eligibility
50 Years and older
Enrollment
1,312 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2019
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 20, 2022 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Phase 2 Interventional

A Phase 2A Dose-ranging and Pharmacokinetic Study of an Oral Vitamin D Compound (DP001) in Secondary Hyperparathyroidism

NCT01653379
View directory record Official record
Conditions
Secondary Hyperparathyroidism
Interventions
DP001
Drug
Lead sponsor
Deltanoid Pharmaceuticals
Industry
Eligibility
18 Years and older
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
6
States / cities
Tucson, Arizona • Tustin, California • Denver, Colorado + 3 more
Source: ClinicalTrials.gov public record
Updated Aug 15, 2017 · Synced Sep 27, 2026, 10:46 AM EDT
Completed Not applicable Interventional

A Pilot Study of the Impact of Vitamin D3 on Muscle Performance in Elderly Women

NCT00986596
View directory record Official record
Conditions
Sarcopenia, Falls
Interventions
vitamin D3, Placebo
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
65 Years and older · Female only
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 9, 2012 · Synced Sep 27, 2026, 10:46 AM EDT