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ClinicalTrials.gov public records Last synced Oct 2, 2026, 7:53 PM EDT

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Showing 25–48 of 181 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Supplemental Vitamin D Clear all
Completed Early Phase 1 Interventional Accepts healthy volunteers

Optimization of Blood Levels of 25(OH)-Vitamin D in African Americans

NCT04939792
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D, Placebo, Vitamin D + L-cysteine, L-cysteine
Drug
Lead sponsor
Louisiana State University Health Sciences Center Shreveport
Other
Eligibility
18 Years to 65 Years
Enrollment
165 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Shreveport, Louisiana
Source: ClinicalTrials.gov public record
Updated Jun 8, 2023 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Assessment of DHA On Reducing Early Preterm Birth

NCT02626299
View directory record Official record
Conditions
Preterm Birth
Interventions
Docosahexaenoic acid - 800mg/day, Docosahexaenoic acid - 200mg/day, Placebo
Drug · Other
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
1,100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
3
States / cities
Kansas City, Kansas • Cincinnati, Ohio • Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 30, 2021 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Phase 2 Interventional Results available

Vitamin D Dose Finding Study

NCT01092338
View directory record Official record
Conditions
HIV Infections, AIDS
Interventions
Cholecalciferol (Vit D3)
Drug
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
5 Years to 24 Years
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 18, 2013 · Synced Oct 2, 2026, 7:53 PM EDT
Active, not recruiting Phase 4 Interventional

Romosozumab Use to Build Skeletal Integrity

NCT05058976
View directory record Official record
Conditions
Osteoporosis, Osteoporosis, Postmenopausal, Osteoporosis Fracture
Interventions
Romosozumab, Placebo, Zoledronic acid, Calcium and Vitamin D
Drug · Dietary Supplement
Lead sponsor
Susan L. Greenspan
Other
Eligibility
65 Years and older · Female only
Enrollment
184 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 17, 2026 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Magnesium and Vitamin D Supplementation and Cardiometabolic Outcomes

NCT03134417
View directory record Official record
Conditions
Overweight and Obesity, Vitamin D Deficiency, Magnesium Deficiency, Cardiovascular Risk Factor
Interventions
Vitamin D and magnesium, Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Drexel University
Other
Eligibility
30 Years to 70 Years
Enrollment
109 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 27, 2021 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Not applicable Interventional Results available

D Vitamin Intervention in VA

NCT01375660
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Mar 6, 2015 · Synced Oct 2, 2026, 7:53 PM EDT
Not listed No phase listed Observational

Malnutrition's Role in Fall Risk

NCT03011918
View directory record Official record
Conditions
Falling Injury, Nutrition Disorder
Interventions
Data Collection prior to first fall for all fallers, Hgb value, Vitamin D, C-Reactive Protein
Other
Lead sponsor
Louis Stokes VA Medical Center
Federal
Eligibility
18 Years and older
Enrollment
485 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 6, 2017 · Synced Oct 2, 2026, 7:53 PM EDT
Active, not recruiting Not applicable Interventional

Randomized Trial of Enteral Vitamin D Supplementation in Infants < 28 Weeks Gestational Age or <1000 Grams Birth Weight

NCT05694689
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
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Oct 2, 2026, 7:53 PM EDT
Withdrawn Phase 3 Interventional

Therapeutic Benefit of Preoperative Supplemental Vitamin D in Patients Undergoing Major Surgical Procedures.

NCT02138591
View directory record Official record
Conditions
Vitamin d Deficiency
Interventions
Blood draw pre-operatively, Blood draw post-operative Day 1, Blood draw post-operative Day 2
Procedure
Lead sponsor
University of Missouri, Kansas City
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 16, 2017 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Calcium, Vitamin D, Magnesium, and Zinc Absorption in Children

NCT00868738
View directory record Official record
Conditions
Mineral Absorption
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
Baylor College of Medicine
Other
Eligibility
4 Years to 8 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Nov 2, 2011 · Synced Oct 2, 2026, 7:53 PM EDT
Terminated Phase 4 Interventional

Clinical Effects of Vitamin D Repletion in Patients With Parkinson's Disease

NCT00571285
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Jan 24, 2017 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Single Group Study to Evaluate the Effects of a Supplement on Premenstrual Syndrome

NCT06124326
View directory record Official record
Conditions
Premenstrual Syndrome
Interventions
Premenstrual Syndrome Supplement
Dietary Supplement
Lead sponsor
Rael
Industry
Eligibility
18 Years to 40 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Aug 23, 2024 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Efficacy of Nutritional Supplementation on Physical-activity Mediated Changes in Physical Functioning Older Adults at Risk for Mobility Disability (The VIVE2 Study)

NCT01542892
View directory record Official record
Conditions
Sarcopenia
Interventions
Exercise Intervention, Supplement Intervention
Other · Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
70 Years and older
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 18, 2014 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of a Female Hormone Balance Supplement on Symptoms of Polycystic Ovary Syndrome and Severe Premenstrual Syndrome

NCT06124300
View directory record Official record
Conditions
Polycystic Ovary Syndrome, Premenstrual Syndrome
Interventions
Female Hormone Balance Supplement
Dietary Supplement
Lead sponsor
Rael
Industry
Eligibility
18 Years to 55 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Aug 23, 2024 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Phase 2 Interventional Results available

Males, Antioxidants, and Infertility Trial

NCT02421887
View directory record Official record
Conditions
Male Infertility
Interventions
Antioxidant Supplement, Placebo
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
18 Years and older · Male only
Enrollment
171 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
10
States / cities
Los Angeles, California • San Francisco, California • Sunnyvale, California + 7 more
Source: ClinicalTrials.gov public record
Updated Sep 4, 2019 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Curves 30/30 Study

NCT04344821
View directory record Official record
Conditions
Weight Loss
Interventions
Curves Calcium, Placebo
Dietary Supplement
Lead sponsor
Texas A&M University
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
57 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Apr 15, 2020 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Phase 2Phase 3 Interventional

Efficacy of a Novel Multivitamin-Mineral Supplement in Preventing Vitamin Deficiency in Postoperative Bariatric Patients

NCT01475617
View directory record Official record
Conditions
Bariatric Surgery Candidate
Interventions
AquaVanta Chewable Tablet, Flinstones Complete, Nature Made Calcium Softgels, Twin Labs Iron Caps, Rexall Vitamin B12 Tablet
Dietary Supplement
Lead sponsor
Yasoo Health
Industry
Eligibility
18 Years to 65 Years
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 22, 2015 · Synced Oct 2, 2026, 7:53 PM 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 2, 2026, 7:53 PM EDT
Not listed Not applicable Interventional

Lifestyle Intervention Program for Cognitive Impairment

NCT02741804
View directory record Official record
Conditions
Mild Cognitive Impairment
Interventions
BBH-1001 Brain Health Supplement, Lifestyle Intervention, Brain Health Placebo
Dietary Supplement · Other
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
55 Years and older
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 27, 2016 · Synced Oct 2, 2026, 7:53 PM EDT
Completed No phase listed Observational

Vitamin D Replacement in Nonalcoholic Fatty Liver Disease

NCT03084328
View directory record Official record
Conditions
Nonalcoholic Fatty Liver
Interventions
Vitamind D
Dietary Supplement
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older
Enrollment
48 participants
Timeline
2012 – 2017
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 13, 2017 · Synced Oct 2, 2026, 7:53 PM EDT
Recruiting Not applicable Interventional

Preserving Physical Function in Older Adults With Cancer: Impact of an Optimizing Nutrition Intervention Applied Before and After Surgery

NCT05912257
View directory record Official record
Conditions
Cancer
Interventions
Structured perioperative nutrition and exercise, Nutrition and Exercise Counseling
Behavioral
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
55 Years and older
Enrollment
188 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated May 20, 2026 · Synced Oct 2, 2026, 7:53 PM EDT
Recruiting Phase 2 Interventional

Essential Amino Acid Supplementation for Femoral Fragility Fractures

NCT06050668
View directory record Official record
Conditions
Femoral Fracture, Fragility Fracture, Muscle Atrophy
Interventions
Essential Amino Acid Supplementation
Combination Product
Lead sponsor
Michael C Willey
Other
Eligibility
65 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
2
States / cities
Iowa City, Iowa • Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 15, 2026 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Establishing the Vitamin D Requirements During Lactation

NCT00412074
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
400 IU Vitamin D3 (cholecalciferol), 2400 IU Vitamin D3 (cholecalciferol), 6400 IU Vitamin D3 (cholecalciferol)
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
460 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2012
U.S. locations
2
States / cities
Rochester, New York • Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 4, 2018 · Synced Oct 2, 2026, 7:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin D Status on Bones in Breastfed Infants

NCT00697294
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Tri-Vi-Sol
Dietary Supplement
Lead sponsor
Baylor College of Medicine
Other
Eligibility
Up to 2 Hours
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2011
U.S. locations
3
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Dec 5, 2011 · Synced Oct 2, 2026, 7:53 PM EDT