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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: 4 Vitamin D Clear all
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin D Intervention and Associated Changes in the Gut Microbiome and Vitamin D Levels in Healthy Adults

NCT05387876
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Vitamin D intervention, Placebo intervention
Dietary Supplement
Lead sponsor
Baylor University
Other
Eligibility
18 Years to 79 Years
Enrollment
43 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Waco, Texas
Source: ClinicalTrials.gov public record
Updated May 23, 2022 · Synced Sep 27, 2026, 9:02 PM EDT
Withdrawn Phase 1 Interventional

PDT Plus Vitamin D3 for Anal Dysplasia

NCT02698293
View directory record Official record
Conditions
Anal Dysplasia, Carcinoma in Situ
Interventions
Gliolan, Vitamin D3 cholecalciferol), Photodynamic Therpay
Drug · Other
Lead sponsor
Abramson Cancer Center at Penn Medicine
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 3, 2026 · Synced Sep 27, 2026, 9:02 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 24, 2013 · Synced Sep 27, 2026, 9:02 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D and Sexual Health

NCT01450462
View directory record Official record
Conditions
Bacterial Vaginosis
Interventions
Vitamin D3 (cholecalciferol), Placebo
Dietary Supplement
Lead sponsor
Ohio State University
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
118 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 3, 2013 · Synced Sep 27, 2026, 9:02 PM EDT
Completed Phase 4 Interventional

Comparison of Absorption of Vitamin D in Cystic Fibrosis

NCT01880346
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Vitamin D Powder, Vitamin D Oil
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
18 Years to 59 Years
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 19, 2015 · Synced Sep 27, 2026, 9:02 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Misoprostol Versus Dilapan-S for Cervical Preparation

NCT00835731
View directory record Official record
Conditions
Cervical Ripening
Interventions
misoprostol, Dilapan-S, vitamin B-12
Drug · Device
Lead sponsor
Planned Parenthood League of Massachusetts
Other
Eligibility
18 Years and older · Female only
Enrollment
125 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 22, 2017 · Synced Sep 27, 2026, 9:02 PM 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, 9:02 PM EDT
Completed Phase 3 Interventional Results available

Combination Chemotherapy in Treating Young Patients With Newly Diagnosed Acute Promyelocytic Leukemia

NCT00866918
View directory record Official record
Conditions
Childhood Acute Promyelocytic Leukemia With PML-RARA, Myeloid Neoplasm
Interventions
Arsenic Trioxide, Cytarabine, Diagnostic Laboratory Biomarker Analysis, Idarubicin, Mercaptopurine, Methotrexate, Mitoxantrone Hydrochloride, Tretinoin
Drug · Other
Lead sponsor
Children's Oncology Group
Network
Eligibility
2 Years to 21 Years
Enrollment
106 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2022
U.S. locations
112
States / cities
Birmingham, Alabama • Phoenix, Arizona • Little Rock, Arkansas + 87 more
Source: ClinicalTrials.gov public record
Updated Oct 24, 2022 · Synced Sep 27, 2026, 9:02 PM EDT
Completed Not applicable Interventional Results available

Feasibility and Effectiveness of Micronutrients as Palliative Care Therapy in Patients With Congestive Heart Failure

NCT01474486
View directory record Official record
Conditions
Congestive Heart Failure, Ischemic Cardiomyopathy
Interventions
Micronutrients
Drug
Lead sponsor
Phoenix VA Health Care System
Federal
Eligibility
18 Years to 89 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Jun 9, 2021 · Synced Sep 27, 2026, 9:02 PM EDT
Active, not recruiting Phase 3 Interventional Results available

Tretinoin and Arsenic Trioxide in Treating Patients With Untreated Acute Promyelocytic Leukemia

NCT02339740
View directory record Official record
Conditions
Acute Promyelocytic Leukemia With t(15;17)(q24.1;q21.2); PML-RARA
Interventions
Arsenic Trioxide, Cytarabine, Dexamethasone, Idarubicin, Laboratory Biomarker Analysis, Mitoxantrone Hydrochloride, Quality-of-Life Assessment, Questionnaire Administration, Tretinoin
Drug · Other
Lead sponsor
Children's Oncology Group
Network
Eligibility
12 Months to 21 Years
Enrollment
158 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2029
U.S. locations
152
States / cities
Birmingham, Alabama • Mobile, Alabama • Anchorage, Alaska + 121 more
Source: ClinicalTrials.gov public record
Updated Feb 17, 2026 · Synced Sep 27, 2026, 9:02 PM EDT
Recruiting Phase 4 Interventional

Postpartum Vaginal Estrogen for Breastfeeding Patients

NCT05457972
View directory record Official record
Conditions
Breastfeeding, Postpartum Sexual Dysfunction, Vaginal Atrophy
Interventions
Estradiol, Vaginal Moisturizer
Drug · Device
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 22, 2026 · Synced Sep 27, 2026, 9:02 PM 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, 9:02 PM 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, 9:02 PM 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, 9:02 PM 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, 9:02 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 27, 2026, 9:02 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Vitamin D Supplementation and Physical Function in Older Adults

NCT01179503
View directory record Official record
Conditions
Physical Function, Vitamin D Insufficiency
Interventions
calcium, Vitamin D plus calcium
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
70 Years to 89 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 16, 2018 · Synced Sep 27, 2026, 9:02 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Skin Barrier Assessment in Pregnancy and at Birth

NCT04445298
View directory record Official record
Conditions
Pregnancy Related, Allergy, Atopic Dermatitis Eczema, Asthma in Children, Food Allergy
Interventions
Transepidermal water loss, Skin tape stripping, Blood draw, Bacterial PCR swab
Diagnostic Test
Lead sponsor
National Jewish Health
Other
Eligibility
0 Minutes to 55 Years
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Sep 9, 2020 · Synced Sep 27, 2026, 9:02 PM EDT
Completed Phase 2 Interventional Results available

Cholecalciferol and Genistein Before Surgery in Treating Patients With Early Stage Prostate Cancer

NCT01325311
View directory record Official record
Conditions
Prostate Adenocarcinoma, Stage I Prostate Cancer, Stage IIA Prostate Cancer, Stage IIB Prostate Cancer
Interventions
Cholecalciferol, Genistein, Laboratory Biomarker Analysis, Pharmacological Study, Placebo
Drug · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older · Male only
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
11
States / cities
Birmingham, Alabama • Baltimore, Maryland • Burlington, Massachusetts + 6 more
Source: ClinicalTrials.gov public record
Updated Aug 2, 2016 · Synced Sep 27, 2026, 9:02 PM EDT
Terminated Phase 3 Interventional Results available

Vitamin D Supplement Study for Stage Three and Four Chronic Kidney Disease (CKD) Patients

NCT01173848
View directory record Official record
Conditions
Chronic Kidney Disease Stage 3 and 4
Interventions
Ergocalciferol, Cholecalciferol
Drug
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years to 99 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 3, 2017 · Synced Sep 27, 2026, 9:02 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Study of Parental Ratings of Quality of Life and Body Composition in 5-19 Year Olds While Participating in the Good NEWS 4 Kids Program

NCT01855009
View directory record Official record
Conditions
Quality of Life, Body Mass Index
Interventions
MannaBears, AlgaeCal Calcium, Calcium carbonate, Vitamin D3
Dietary Supplement
Lead sponsor
Integrative Health Technologies, Inc.
Network
Eligibility
5 Years to 19 Years
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Jun 23, 2013 · Synced Sep 27, 2026, 9:02 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Improving Community Ambulation After Hip Fracture

NCT01783704
View directory record Official record
Conditions
Hip Fracture
Interventions
Nutrition, PUSH, PULSE
Dietary Supplement · Behavioral
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
60 Years and older
Enrollment
210 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2017
U.S. locations
4
States / cities
Farmington, Connecticut • Baltimore, Maryland • Lebanon, New Hampshire + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 26, 2022 · Synced Sep 27, 2026, 9:02 PM EDT
Terminated Phase 4 Interventional Results available

Thiazolidinedione Intervention With Vitamin D Evaluation

NCT00879970
View directory record Official record
Conditions
Diabetes Mellitus, Type 2
Interventions
pioglitazone, rosiglitazone, placebo, Vitamin D, Placebo
Drug · Dietary Supplement
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
50 Years and older
Enrollment
1,332 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
23
States / cities
Long Beach, California • Los Angeles, California • Northridge, California + 19 more
Source: ClinicalTrials.gov public record
Updated Apr 17, 2017 · Synced Sep 27, 2026, 9:02 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Preventing Health Disparities During Pregnancy Through Vitamin D Supplementation

NCT01932788
View directory record Official record
Conditions
Vitamin D3 Deficiency
Interventions
Vitamin D3 4000 IU in gummy form, Placebo gummy vitamin
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
342 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2018
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Nov 20, 2018 · Synced Sep 27, 2026, 9:02 PM EDT