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ClinicalTrials.gov public records Last synced Oct 6, 2026, 3:58 AM EDT

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Showing 49–72 of 298 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin A supplementation Clear all
Terminated Not applicable Interventional

The Pittsburgh Vitamin D Study: Vitamin D Supplementation in Vitamin D-deficient Subjects at Risk of Lung Cancer

NCT02532062
View directory record Official record
Conditions
Deficiency of Vitamin D3, COPD
Interventions
Cholecalciferol, multivitamin, Placebo
Dietary Supplement
Lead sponsor
University of Pittsburgh
Other
Eligibility
50 Years to 85 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 26, 2018 · Synced Oct 6, 2026, 3:58 AM EDT
Recruiting Phase 2 Interventional

Impact of Vitamin D Supplementation on the Rate of Pathologic Complete Response in Vitamin D Deficient Patients

NCT04677816
View directory record Official record
Conditions
Triple Negative Breast Cancer, Vitamin D Deficiency, Invasive Breast Cancer
Interventions
Standard of Care Neoadjuvant Chemotherapy (NAC), Vitamin D3, Drug Diary
Drug · Dietary Supplement · Other
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 28, 2026 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Study of Pralatrexate & Gemcitabine With B12 & Folic Acid to Treat Relapsed/Refractory Lymphoproliferative Malignancies

NCT00481871
View directory record Official record
Conditions
Relapsed or Refractory Lymphoproliferative Malignancies, Hodgkin's Lymphoma, Peripheral T-cell Lymphoma, B-cell Lymphoma, Waldenstrom's Macroglobulinemia
Interventions
Pralatrexate Injection, Gemcitabine Hydrochloride, Vitamin B12, Folic Acid
Drug · Dietary Supplement
Lead sponsor
Acrotech Biopharma Inc.
Industry
Eligibility
18 Years and older
Enrollment
119 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
15
States / cities
Los Angeles, California • Stanford, California • Denver, Colorado + 11 more
Source: ClinicalTrials.gov public record
Updated Jan 7, 2020 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Not applicable Interventional

Effect of Omega-3-fatty Acids on Blood Levels Omega-3 Fatty Acids in Patients With Age-related Macular Degeneration

NCT01653184
View directory record Official record
Conditions
Macular Degeneration
Interventions
Omega-3 fatty acid
Dietary Supplement
Lead sponsor
Wills Eye
Other
Eligibility
55 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
4
States / cities
Cherry Hill, New Jersey • Bethlehem, Pennsylvania • Huntingdon Valley, Pennsylvania + 1 more
Source: ClinicalTrials.gov public record
Updated Dec 12, 2016 · Synced Oct 6, 2026, 3:58 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 6, 2026, 3:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Inadequacy in Rural Populations, Evaluation of Correction by Food Supplementation

NCT00690417
View directory record Official record
Conditions
Vitamin D Insufficiency, Vitamin D Deficiency
Interventions
Cholecalciferol (vitamin D3)
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
55 Years and older · Female only
Enrollment
108 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2011
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 24, 2011 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Antenatal Micronutrient Supplementation and Infant Survival

NCT00860470
View directory record Official record
Conditions
Infant Mortality, Preterm Birth, Low Birth Weight, Neonatal Mortality, Perinatal Mortality
Interventions
Iron (27 mg) - folic acid (600 ug), Multiple micronutrient
Dietary Supplement
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
12 Years to 45 Years · Female only
Enrollment
44,567 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2012
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 19, 2022 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin C Enriched Hydrolyzed Collagen, PrimaColl™, Whey Protein, or Placebo on Collagen Synthesis

NCT05427279
View directory record Official record
Conditions
Effect of Food Supplement
Interventions
Placebo, Hydrolized Collagen, PrimaColl, Whey protein
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years to 30 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated May 8, 2026 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assessment of Vitamin D Supplementation and Immune Function

NCT01399151
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D - Treatment 1, Vitamin D - Treatment 2, Vitamin D - Treatment 3
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
20 Years to 49 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Apr 22, 2014 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D and Prostate Cancer: A Clinical Study Enrolling Subjects Undergoing Prostatectomy

NCT02726113
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Dec 3, 2019 · Synced Oct 6, 2026, 3:58 AM EDT
Withdrawn Phase 2 Interventional

Medications After Adolescent Bariatric Surgery

NCT04572217
View directory record Official record
Conditions
Pediatric Obesity
Interventions
Topiramate, Phentermine
Drug
Lead sponsor
Janey Pratt
Other
Eligibility
12 Years to 25 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022
U.S. locations
1
States / cities
Palo Alto, California
Source: ClinicalTrials.gov public record
Updated May 31, 2025 · Synced Oct 6, 2026, 3:58 AM EDT
Not listed Not applicable Interventional

Effect of Vitamin D Status and Repletion on Postoperative Total Joint Arthroplasty Complications

NCT04229368
View directory record Official record
Conditions
Hip Arthropathy, Knee Arthropathy, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Enrollment
900 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 16, 2023 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Phase 1 Interventional

Effect of Fish Oil and Vitamin C on Exercise-Induced Bronchoconstriction and Airway Inflammation in Asthma

NCT01057615
View directory record Official record
Conditions
Asthma
Interventions
Fish Oil, Ascorbic Acid, Fish Oil Placebo, Ascorbic Acid Placebo
Dietary Supplement
Lead sponsor
Indiana University
Other
Eligibility
18 Years to 40 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010
U.S. locations
1
States / cities
Bloomington, Indiana
Source: ClinicalTrials.gov public record
Updated Jan 31, 2011 · Synced Oct 6, 2026, 3:58 AM EDT
Terminated Phase 2 Interventional

Vitamin D Supplementation for Adults With Neurofibromatosis Type 1 (NF1)

NCT01968590
View directory record Official record
Conditions
Neurofibromatosis Type 1 (NF1)
Interventions
Cholecalciferol
Drug
Lead sponsor
University of Utah
Other
Eligibility
25 Years to 40 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
2
States / cities
Cincinnati, Ohio • Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 25, 2022 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Not applicable Interventional

The Effect of Vitamin D Supplementation on Glucose Metabolism in Non-Diabetic African American Adults

NCT01141192
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
vitamin D3, cholecalciferol, Inactive comparator
Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
19 Years to 60 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 10, 2010 · Synced Oct 6, 2026, 3:58 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

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

NCT01785004
View directory record Official record
Conditions
Adiposity
Interventions
Vitamin D3 (cholecalciferol), 2000 IU per day, omega-3 fatty acids (fish oil)
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 13, 2021 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Phase 2 Interventional

Vitamin D3 Supplementation for Heart Failure Patients

NCT01636570
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Apr 26, 2017 · Synced Oct 6, 2026, 3:58 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Impacts of Nicotinamide Riboside on Functional Capacity and Muscle Physiology in Older Veterans

NCT04691986
View directory record Official record
Conditions
Sarcopenia, Nicotinamide Adenine Dinucleotide Concentration, Muscle Quality and NAD+ Content
Interventions
Nicotinamide Riboside, Placebo
Dietary Supplement · Other
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
65 Years to 85 Years
Enrollment
74 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 21, 2026 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Collegiate Athlete Study

NCT07631312
View directory record Official record
Conditions
Iron Deficiency, Iron Deficiency Anemia (IDA), Vitamin D Deficiency, Vitamin D Insufficiency, Low Energy Availability, Bone Density
Interventions
Iron and Vitamin D Deficiencies Correction
Dietary Supplement
Lead sponsor
Morehouse School of Medicine
Other
Eligibility
18 Years and older
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 8, 2026 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Phase 3 Interventional Results available

A Severity-Adapted Clinical Trial of Diminished Bone Mineral Density in Acute Lymphoblastic Leukemia Survivors

NCT00186901
View directory record Official record
Conditions
Leukemia, Lymphoblastic, Acute, Osteoporosis
Interventions
Calcium carbonate (Tums), vitamin D, Placebo
Drug · Other
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
Not listed
Enrollment
429 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2011
U.S. locations
3
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated May 10, 2017 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Controlled Trial of Prenatal Vitamin D3 Supplementation to Prevent Vitamin D Deficiency in Mothers and Their Infants

NCT00610688
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Prenatal Vitamin, Cholecalciferol (Vitamin D3)
Drug
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
192 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2012
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 19, 2021 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Phase 1 Interventional

The Role of Vitamins E and C in Maintaining Lung Health in People With Asthma

NCT00142610
View directory record Official record
Conditions
Asthma
Interventions
Vitamin
Dietary Supplement
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 50 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 4, 2013 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Study of Nutritional Supplementation in Altering Ecchymosis, Erythema and Health Outcomes Associated With Aesthetic Procedures

NCT01919359
View directory record Official record
Conditions
Ecchymosis and Erythema Commonly Associated With Soft Tissue Filler Injections
Interventions
Multizyme Cellular Vitality Cyruta Plus SHEP
Dietary Supplement
Lead sponsor
DeNova Research
Other
Eligibility
18 Years and older
Enrollment
108 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 1, 2018 · Synced Oct 6, 2026, 3:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Pilot Feasibility of Rice Bran Supplementation in Children

NCT02557373
View directory record Official record
Conditions
Dietary Rice Bran Supplementation
Interventions
Vitamin A, Rice Bran + Vitamin A
Dietary Supplement
Lead sponsor
Colorado State University
Other
Eligibility
4 Months to 10 Months
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 21, 2017 · Synced Oct 6, 2026, 3:58 AM EDT