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ClinicalTrials.gov public records Last synced Oct 16, 2026, 4:42 AM EDT

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Showing 457–480 of 506 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamins A and D Clear all
Completed Phase 3 Interventional

Osteoporosis Prevention After Heart Transplant

NCT00000412
View directory record Official record
Conditions
Osteoporosis, Cardiac Transplantation
Interventions
Alendronate, Calcitriol, Placebo Alendronate, Placebo Calcitriol
Drug
Lead sponsor
Columbia University
Other
Eligibility
20 Years to 70 Years
Enrollment
149 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1997 – 2002
U.S. locations
2
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 7, 2015 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Vitamin D Status of Pregnant Women and Their Children in Eau Claire, South Carolina

NCT00412087
View directory record Official record
Conditions
Vitamin D Deficiency, Pregnancy
Interventions
cholecalciferol (vitamin D3), cholecalciferol
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
16 Years to 45 Years · Female only
Enrollment
564 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 29, 2016 · Synced Oct 16, 2026, 4:42 AM EDT
Terminated Phase 2 Interventional

A Phase II Trial of Calcitriol and Naproxen in Patients With Recurrent Prostate Cancer

NCT00383487
View directory record Official record
Conditions
Prostatic Neoplasms, Prostate Cancer
Interventions
Calcitriol, Naproxen-n-butyl nitrate
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 90 Years · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Jan 28, 2013 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Effect of a Meal on Vitamin D Absorption

NCT01268176
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
50 Years to 69 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 13, 2013 · Synced Oct 16, 2026, 4:42 AM EDT
Active, not recruiting Not applicable Interventional

ViDES Trial (Vitamin D Extra Supplementation)

NCT05459298
View directory record Official record
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
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Not applicable Interventional Results available

Oral Paricalcitol in Kidney Transplant Recipients

NCT00587158
View directory record Official record
Conditions
Transplant; Failure, Kidney, Renal Disease, End Stage, Hyperparathyroidism, Secondary
Interventions
Paricalcitol, Corticosteroid Avoidance Immune Suppression Protocol
Drug · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
2
States / cities
Scottsdale, Arizona • Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 13, 2013 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Calcium Supplementation for a Healthy Weight (CaSHeW)

NCT01363115
View directory record Official record
Conditions
Obesity, Overweight
Interventions
Orange Juice fortified with Calcium and Vitamin D, Orange juice without Ca or VitD, Nutritional Counseling
Dietary Supplement · Behavioral
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
130 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2006
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 1, 2011 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Vitamin D Supplementation in RNA-seq Profiles of Single-core Prostate Samples, Among Veterans

NCT04621500
View directory record Official record
Conditions
Prostate Cancer, Vitamin D Deficiency, Stress Reaction
Interventions
cholecalciferol, Standard of Care Prostate Biopsy - collection of 13th core for RNA-seq, Standard of Care Prostate Biopsies at baseline and after one year vitamin D3 supplementation, Allostatic Load
Drug · Procedure · Diagnostic Test
Lead sponsor
Medical University of South Carolina
Other
Eligibility
50 Years to 75 Years · Male only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2022
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 4, 2025 · Synced Oct 16, 2026, 4:42 AM 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 24, 2013 · Synced Oct 16, 2026, 4:42 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Evaluate the Change in Iron, Vitamin D, and C-Reactive Protein Level (CRP) in a 12 to 24 Week Period

NCT01328704
View directory record Official record
Conditions
Anemia, Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
Avera McKennan Hospital & University Health Center
Other
Eligibility
30 Years to 50 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Sioux Falls, South Dakota
Source: ClinicalTrials.gov public record
Updated Aug 25, 2014 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Not applicable Interventional

Haptoglobin Phenotype, Vitamin E and High-density Lipoprotein (HDL) Function in Type 1 Diabetes

NCT01098994
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Jun 3, 2014 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Not applicable Interventional Results available

Prehabilitation of Veterans With Exercise and Nutrition

NCT04485611
View directory record Official record
Conditions
Frailty
Interventions
Supervised aerobic + resistance training and nutritional support
Behavioral
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
50 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 22, 2025 · Synced Oct 16, 2026, 4:42 AM EDT
Active, not recruiting Not applicable Interventional

The TRIABETES - ARMMS-T2D Study: A Randomized Trial to Compare Surgical and Medical Treatments for Type 2 Diabetes

NCT01047735
View directory record Official record
Conditions
Type 2 Diabetes Mellitus, Obesity
Interventions
Roux-en-Y Gastric Bypass Surgery, Laparoscopic Adjustable Gastric Banding, Lifestyle Weight Loss Intervention
Procedure · Behavioral
Lead sponsor
University of Pittsburgh
Other
Eligibility
25 Years to 55 Years
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2028
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Not applicable Interventional

Combined Estrogen Blockade of the Breast With Exemestane and Raloxifene in Postmenopausal Women With a History of Breast Cancer Who Have No Clinical Evidence of Disease

NCT00200174
View directory record Official record
Conditions
Breast Cancer
Interventions
Raloxifene followed by combination therapy, Exemestane followed by combination therapy
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2008
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 5, 2023 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Phase 3 Interventional Results available

High Dose Preoperative Cholecalciferol Supplementation and Perioperative Vitamin D Status

NCT01689779
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
100,000 IU cholecalciferol, Placebo
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 28, 2017 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Assess the Effect of My Happy Flo on Alleviating Period Symptoms and Heavy Flows.

NCT06522672
View directory record Official record
Conditions
Menstrual Cramps, Women's Health, Fatigue
Interventions
My Happy Flo
Dietary Supplement
Lead sponsor
My Happy Flo
Industry
Eligibility
18 Years and older · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Nov 20, 2024 · Synced Oct 16, 2026, 4:42 AM 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 18, 2017 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Phase 4 Interventional Results available

Paricalcitol Versus Calcitriol for Efficacy and Safety in Stage 3/4 Chronic Kidney Disease (CKD) With Secondary Hyperparathyroidism (SHPT)

NCT00823303
View directory record Official record
Conditions
Secondary Hyperparathyroidism, Chronic Kidney Disease
Interventions
Paricalcitol, Calcitriol
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
4
States / cities
Chicago, Illinois • Evanston, Illinois • Detroit, Michigan + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 7, 2014 · Synced Oct 16, 2026, 4:42 AM EDT
Withdrawn Not applicable Interventional

Vitamin D Status in Lower Extremity Joint Replacement Surgery Patients

NCT01858051
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
Cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 100 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 30, 2017 · Synced Oct 16, 2026, 4:42 AM EDT
Suspended No phase listed Observational Accepts healthy volunteers

Skin Characteristics of Parents of Food Allergic Pediatric Patients

NCT04198753
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Apr 13, 2020 · Synced Oct 16, 2026, 4:42 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 28, 2017 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Phase 3 Interventional Results available

A Study to Evaluate Oral Salmon Calcitonin in the Treatment of Osteoporosis in Postmenopausal Women Taking Calcium and Vitamin D

NCT00525798
View directory record Official record
Conditions
Osteoporosis
Interventions
SMC021 Oral calcitonin, SMC021 Placebo
Drug
Lead sponsor
Nordic Bioscience A/S
Industry
Eligibility
55 Years to 85 Years · Female only
Enrollment
4,665 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
3
States / cities
Gainesville, Georgia • Detroit, Michigan • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Oct 29, 2012 · Synced Oct 16, 2026, 4:42 AM EDT
Completed Not applicable Interventional Results available

Treatment of Vitamin D Deficiency in Intestinal Rehabilitation Clinic Patients With a Portable Ultraviolet B Lamp

NCT01930539
View directory record Official record
Conditions
Vitamin D Deficiency, Short Bowel Syndrome
Interventions
Ultraviolet B lamp
Device
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Oct 4, 2023 · Synced Oct 16, 2026, 4:42 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers Results available

LungVITamin D and OmegA-3 Trial (lungVITAL)

NCT01728571
View directory record Official record
Conditions
COPD, Asthma, Pulmonary Function, Pneumonia
Interventions
Vitamin D3, fish oil, Vitamin D3 placebo, Fish oil placebo
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 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 7, 2026 · Synced Oct 16, 2026, 4:42 AM EDT