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 7, 2026, 11:27 PM EDT

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

Showing 121–144 of 505 matching trials from the live ClinicalTrials.gov search.
Conditions
Obesity, Pediatric, Obesity, Childhood, Obesity, Morbid, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Columbia University
Other
Eligibility
5 Years to 11 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
New York, New York
Conditions
Determine Effect of Vitamin D on Bone Health in Elderly African American Women
Interventions
Vitamin D 3, placebo
Dietary Supplement · Other
Lead sponsor
Winthrop University Hospital
Other
Eligibility
60 Years and older · Female only
Enrollment
260 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2016
U.S. locations
1
States / cities
Mineola, New York
Conditions
Psoriasis
Interventions
Topical Therapy, Phototherapy and Systemic Therapy, Biologic Therapy
Other
Lead sponsor
University of California, Irvine
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Irvine, California
Conditions
Glioma, IDH Mutation, Astrocytoma, Oligodendroglioma
Interventions
Retifanlimab, All-trans retinoic acid
Drug
Lead sponsor
Stephen Bagley, MD, MSCE
Other
Eligibility
18 Years and older
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2028
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Conditions
Knee Osteoarthritis
Interventions
Stem Cell Support Formula, Placebo
Dietary Supplement
Lead sponsor
Regenexx, LLC
Industry
Eligibility
18 Years to 80 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
2
States / cities
Broomfield, Colorado • Lone Tree, Colorado
Conditions
Osteoporosis, Prostate Cancer
Interventions
calcium carbonate, cholecalciferol, Estrogen Antagonists, risedronate sodium, placebo
Dietary Supplement · Drug · Other
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
18 Years and older · Male only
Enrollment
71 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2010
U.S. locations
112
States / cities
Scottsdale, Arizona • Jacksonville, Florida • Aurora, Illinois + 71 more
Suspended No phase listed Observational Accepts healthy volunteers

Skin Characteristics of Parents of Food Allergic Pediatric Patients

NCT04198753
Conditions
Food Allergy in Children
Interventions
Skin tape stripping, Skin barrier assessment, Blood draw
Diagnostic Test · Device
Lead sponsor
National Jewish Health
Other
Eligibility
18 Years and older
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Denver, Colorado
Conditions
Pancreatic Cancer
Interventions
Gemcitabine, Nab-paclitaxel, Paricalcitol, Placebo
Drug · Other
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
2
States / cities
Boston, Massachusetts • Philadelphia, Pennsylvania
Conditions
Cancer
Interventions
1,25 (OH)2 D3, Inspiratory isometric resistance training, Oral Placebo, Sham Inspiratory Isometric Resistance Training, Threshold Inspiratory Muscle Trainer (IMT)
Drug · Other · Device
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Rochester, Minnesota
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin B6 Dependence of One-Carbon Metabolism

NCT00877812
Conditions
Vitamin B6 Deficiency
Interventions
Arm 1 glycine and leucine, Arm 2 Intervention of Serine and methionine infusion
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
20 Years to 40 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Gainesville, Florida
Conditions
Type 1 Diabetes, Heart Disease
Interventions
Vitamin E, Dummy pills
Dietary Supplement · Other
Lead sponsor
University of Pittsburgh
Other
Eligibility
30 Years and older
Enrollment
87 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Conditions
Chronic Kidney Disease, Kidney Transplantation
Interventions
Doxercalciferol, placebo, 25-OH Vitamin D3
Drug
Lead sponsor
Mariana Markell
Other
Eligibility
18 Years to 65 Years
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
1
States / cities
Brooklyn, New York
Completed No phase listed Observational Results available

Vitamin D and Screening Colonoscopy or Polyp Surveillance

NCT02269332
Conditions
Colon Cancer
Interventions
Screening Colonoscopy
Other
Lead sponsor
Mike O'Callaghan Military Hospital
Federal
Eligibility
18 Years and older
Enrollment
298 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Las Vegas, Nevada
Conditions
Chronic Kidney Disease, Secondary Hyperparathyroidism, Chronic Renal Insufficiency, Chronic Renal Failure
Interventions
CTA018 Injection
Drug
Lead sponsor
OPKO IP Holdings II, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
5
States / cities
Pembroke Pines, Florida • Meridian, Idaho • Springfield, Massachusetts + 2 more
Conditions
Osteoarthritis, Vitamin D Deficiency
Interventions
Vitamin D3
Drug
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 96 Years
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Miami, Florida
Conditions
Vitamin D Deficiency, Nephrolithiasis
Interventions
vitamin D (ergocalciferol)
Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Boston, Massachusetts
Conditions
Diabetes Mellitus, Type 1, Hypoglycemia, Diabetes Mellitus, Diabetes, Autoimmune
Interventions
Cholecalciferol, Omega 3 fatty acid
Drug
Lead sponsor
Rodolfo Alejandro
Other
Eligibility
6 Years to 65 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Miami, Florida
Conditions
Cystic Fibrosis
Interventions
AquADEKs-2, control multivitamin
Drug · Dietary Supplement
Lead sponsor
University of Colorado, Denver
Other
Eligibility
10 Years and older
Enrollment
73 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
15
States / cities
Tucson, Arizona • Aurora, Colorado • Orlando, Florida + 12 more
Conditions
Follicular Lymphoma, Small Lymphocytic Lymphoma, Marginal Zone Lymphoma, Mucosal-Associated Lymphoid Tissue Lymphoma
Interventions
Vitamin D, Rituximab, Placebo
Dietary Supplement · Biological · Other
Lead sponsor
Jonathan Friedberg
Other
Eligibility
18 Years and older
Enrollment
211 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2024
U.S. locations
7
States / cities
Miami, Florida • Atlanta, Georgia • Iowa City, Iowa + 4 more
Conditions
Foot Injuries and Disorders, Ankle Injuries and Disorders, Achilles Tendon Injury
Interventions
medrol dosepak, HYDROcodone Oral Tablet
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years to 95 Years
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
2
States / cities
Atlanta, Georgia • Johns Creek, Georgia
Conditions
Secondary Hyperparathyroidism, Chronic Kidney Disease
Interventions
Etelcalcetide, Standard of Care
Drug · Other
Lead sponsor
Amgen
Industry
Eligibility
0 Years to 18 Years
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2029
U.S. locations
10
States / cities
Los Angeles, California • Aurora, Colorado • Kansas City, Missouri + 7 more
Conditions
Vitamin D Deficiency
Interventions
Placebo, 800 IU/day vitamin D supplementation with feedings in the first 28 days after birth, Usual Care
Dietary Supplement · Other
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
24 Hours to 96 Hours
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
1
States / cities
Galveston, Texas
Conditions
Arthralgia, Musculoskeletal Complications, Pain, Recurrent Breast Cancer, Stage I Breast Cancer, Stage II Breast Cancer, Stage IIIA Breast Cancer, Stage IIIB Breast Cancer, Stage IIIC Breast Cancer
Interventions
letrozole, calcium carbonate, laboratory biomarker analysis, calcium citrate, calcium glucarate, calcium gluconate, cholecalciferol, assessment of therapy complications, musculoskeletal complications management/prevention
Drug · Dietary Supplement · Other + 1 more
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older · Female only
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2010
U.S. locations
1
States / cities
Seattle, Washington
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Dose-dependent Anti-inflammatory Effects of Vitamin D in a Human Gingivitis Model

NCT00779909
Conditions
Gingivitis
Interventions
vitamin D3, Placebo
Drug · Other
Lead sponsor
Boston University
Other
Eligibility
18 Years to 64 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts