Independent directory Public ClinicalTrials.gov records United States
Clear filters

These results were retrieved from the live ClinicalTrials.gov registry. Filters and sort order apply to this result list.

ClinicalTrials.gov public records Last synced Oct 9, 2026, 3:57 PM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 73–96 of 410 matching trials from the live ClinicalTrials.gov search.
Completed Phase 4 Interventional Results available

Vitamin D Plus Fluticasone Propionate

NCT01103934
Conditions
Seasonal Allergic Rhinitis
Interventions
Vitamin D3, Placebo, Fluticasone Propionate
Drug
Lead sponsor
University of Chicago
Other
Eligibility
18 Years to 45 Years
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Chicago, Illinois
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Healthy Combine Study

NCT03136705
Conditions
Healthy
Interventions
Nicotinamide, Lanthanum Carbonate, Lanthanum Carbonate Placebo, Nicotinamide Placebo
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 60 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Chicago, Illinois
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Vitamin D and Omega-3 Hypertension Trial (VITAL Hypertension)

NCT01653678
Conditions
Hypertension
Interventions
Vitamin D-3 (cholecalciferol), 2000 IU, Omega-3 fatty acids (fish oil), Vitamin D placebo, Fish oil placebo
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years to 99 Years
Enrollment
25,875 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Conditions
Pancreatic Cancer, Pancreas Adenocarcinoma, Advanced Pancreatic Cancer, Metastatic Pancreatic Cancer, Metastatic Pancreatic Adenocarcinoma
Interventions
Pembrolizumab, paricalcitol, placebo
Drug
Lead sponsor
Translational Genomics Research Institute
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
6
States / cities
Scottsdale, Arizona • Duarte, California • Westwood, Kansas + 3 more
Conditions
Parkinson's Disease
Interventions
Vitamin D3, Vitamin D3 - high dose, Placebo
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
18 Years to 89 Years
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2015
U.S. locations
1
States / cities
Atlanta, Georgia
Completed Not applicable Interventional Accepts healthy volunteers

Resveratrol for the Prevention of Bone Loss in Postmenopausal Women

NCT06250283
Conditions
Low Bone Mass
Interventions
Resveratrol, Placebo
Dietary Supplement
Lead sponsor
University of Delaware
Other
Eligibility
Female only
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Newark, Delaware
Completed Phase 1 Interventional Accepts healthy volunteers

Effect of Vitamin D and Calcium on Genes in the Colon

NCT00298545
Conditions
Colorectal Polyps, Colorectal Adenoma, Adenocarcinoma
Interventions
placebo and Calcitriol, Calcium and Calcitriol
Drug
Lead sponsor
Rockefeller University
Other
Eligibility
48 Years to 72 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2009
U.S. locations
1
States / cities
New York, New York
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
Completed Not applicable Interventional Results available

Vitamin D Supplements for HIV-positive Patients on cART

NCT01295034
Conditions
HIV-associated Co-morbidities
Interventions
conventional vitamin D treatment, tiered/titrated vitamin D dosing
Dietary Supplement · Drug
Lead sponsor
Andrea Branch
Other
Eligibility
18 Years to 70 Years
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
New York, New York
Conditions
Polycystic Ovary Syndrome
Interventions
Vitamin D, Placebo
Dietary Supplement · Drug
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
1
States / cities
Hershey, Pennsylvania
Conditions
ADHD
Interventions
Calcitriol, Placebo
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
18 Years to 50 Years
Enrollment
3 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
New Haven, Connecticut
Completed Not applicable Interventional Results available

D Vitamin Intervention in VA

NCT01375660
Conditions
Impaired Fasting Glucose, Impaired Glucose Tolerance, Vitamin D Insufficiency
Interventions
Placebo, 50K vitamin D2
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
35 Years to 85 Years · Male only
Enrollment
205 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Chicago, Illinois
Conditions
Prostate Cancer
Interventions
cholecalciferol, placebo
Drug · Other
Lead sponsor
Medical University of South Carolina
Other
Eligibility
19 Years to 90 Years · Male only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
2
States / cities
Charleston, South Carolina
Conditions
Renal Insufficiency
Interventions
Zoledronic Acid, Calcium with vitamin D, Alendronate
Drug · Combination Product
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
59 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2014
U.S. locations
1
States / cities
Omaha, Nebraska
Conditions
Breast Cancer
Interventions
vitamin D, placebo
Dietary Supplement · Other
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
Up to 55 Years · Female only
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
103
States / cities
Anniston, Alabama • Martinez, California • Mountain View, California + 72 more
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Acute Vitamin D Supplementation on Testosterone in Females

NCT06610968
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
Conditions
Osteoporosis, Hypomagnesemia
Interventions
EffCaMgCit, Placebo
Drug · Other
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
21 Years to 99 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Dallas, Texas
Conditions
Hypertension, Vitamin D Deficiency
Interventions
calcitriol, Placebo
Drug
Lead sponsor
University of Utah
Other
Eligibility
55 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
1
States / cities
Salt Lake City, Utah
Conditions
Healthy Volunteers
Interventions
Placebo, Canagliflozin
Drug
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years and older
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
1
States / cities
Bethesda, Maryland
Conditions
Vitamin Deficiency
Interventions
EZPAK, Placebo
Dietary Supplement
Lead sponsor
Optimal Health Research
Other
Eligibility
26 Years to 75 Years
Enrollment
275 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Salt Lake City, Utah
Conditions
Endometriosis
Interventions
Vitamin D3, Fish Oil, Placebo
Dietary Supplement · Other
Lead sponsor
Boston Children's Hospital
Other
Eligibility
12 Years to 25 Years · Female only
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Boston, Massachusetts
Conditions
Heart Failure, Vitamin D Deficiency, Cardiomyopathy, Congestive Heart Failure
Interventions
Placebo Comparator: Sugar Pill, Vitamin D3 (cholecalciferol)
Drug
Lead sponsor
Heidi Moretti, MS, RD
Other
Eligibility
Not listed
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
2
States / cities
Missoula, Montana
Conditions
Plaque Psoriasis, Vitamin D3
Interventions
Triamcinolone, Vitamin D3, Placebo
Drug · Dietary Supplement
Lead sponsor
Wright State University
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
Fairborn, Ohio
Completed Phase 4 Interventional Accepts healthy volunteers

How Does Magnesium Status Influence Calcium Homeostasis?

NCT01593501
Conditions
Magnesium Deficiency, Calcium Metabolism Disorders
Interventions
vitamin D3
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
30 Years to 75 Years · Female only
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin