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ClinicalTrials.gov public records Last synced Nov 15, 2026, 7:13 AM EST

All trial information on this site comes from the official ClinicalTrials.gov public API (clinicaltrials.gov/api/v2), run by the U.S. National Library of Medicine. We only display that public information; we do not add opinions, endorsements, or any other intent. Always review the official ClinicalTrials.gov record for the latest information.

Showing 169–192 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Depression, Depressive Symptoms, Mood
Interventions: vitamin D3, omega-3 fatty acids (fish oil), Fish oil placebo, Vitamin D placebo; Dietary Supplement · Drug
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 50 Years and older
Enrollment: 18,353 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2025
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Type 1 Diabetes Mellitus
Interventions: Recombinant human glutamic acid decarboxylase (rhGAD65) formulated in Alhydrogel®, Colecalciferol 2000 IU, Placebo; Biological · Dietary Supplement
Lead sponsor: Diamyd Medical AB; Industry
Eligibility: 12 Years to 28 Years
Enrollment: 321 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2022 – 2026
U.S. locations: 13
States / cities: Newport Beach, California • Palo Alto, California • San Diego, California + 10 more

Conditions: Hypercholesterolemia, Vitamin D Deficiency
Interventions: Vitamin D (1000 or 2000 IU/day), Placebo; Dietary Supplement · Other
Lead sponsor: University of California, San Francisco; Other
Eligibility: 18 Years and older
Enrollment: 130 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2012
U.S. locations: 1
States / cities: San Francisco, California

Conditions: Osteogenesis Imperfecta, Type I, Osteogenesis Imperfecta Type III, Osteogenesis Imperfecta Type IV
Interventions: setrusumab, Calcium, Vitamin D, zoledronic acid (optional); Drug · Dietary Supplement
Lead sponsor: Ultragenyx Pharmaceutical Inc; Industry
Eligibility: 18 Years to 75 Years
Enrollment: 112 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2017 – 2020
U.S. locations: 12
States / cities: Birmingham, Alabama • Jacksonville, Florida • Baltimore, Maryland + 9 more

Conditions: SARS-CoV-2 Infection
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: University of Chicago; Other
Eligibility: 18 Years and older
Enrollment: 1,475 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020 – 2024
U.S. locations: 2
States / cities: Chicago, Illinois

Conditions: Kidney Failure, Secondary Hyperparathyroidism, Hyperphosphatemia, Hypercalcemia
Interventions: Calcitriol, Paricalcitol; Drug
Lead sponsor: Winthrop University Hospital; Other
Eligibility: 18 Years and older
Enrollment: 16 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2015
U.S. locations: 1
States / cities: Mineola, New York

Conditions: Healthy, no Evidence of Disease
Interventions: cholecalciferol, questionnaire administration, trivalent influenza vaccine; Dietary Supplement · Other · Biological
Lead sponsor: Roswell Park Cancer Institute; Other
Eligibility: 18 Years to 64 Years
Enrollment: 11 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: Buffalo, New York

Conditions: Plaque Psoriasis
Interventions: Calcitriol 3 mcg/g ointment; Drug
Lead sponsor: Galderma R&D; Industry
Eligibility: 2 Years to 12 Years
Enrollment: 18 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2015
U.S. locations: 8
States / cities: San Diego, California • Indianapolis, Indiana • Ann Arbor, Michigan + 5 more

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

Conditions: Leg Cramps, Nocturnal
Interventions: vitamin d, placebo; Drug
Lead sponsor: University of Wisconsin, Madison; Other
Eligibility: 50 Years and older
Enrollment: 29 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2007 – 2011
U.S. locations: 1
States / cities: Madison, Wisconsin

Conditions: Libido, Intimacy, Gastrointestinal Issues
Interventions: Reset, Stay Ready Fiber, Libido, Testosterone supplement; Dietary Supplement
Lead sponsor: 906 CMVI Holdings; Industry
Eligibility: 18 Years to 44 Years · Male only
Enrollment: 36 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2023
U.S. locations: 1
States / cities: Santa Monica, California

Conditions: Warts
Interventions: Vitamin D3, Placebo; Drug
Lead sponsor: Stephen P. Merry; Other
Eligibility: 18 Years and older
Enrollment: 77 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2020 – 2023
U.S. locations: 1
States / cities: Rochester, Minnesota

Conditions: Skin Cancer, Non-Melanoma
Interventions: Not listed
Lead sponsor: University of Alabama at Birmingham; Other
Eligibility: 50 Years and older
Enrollment: 200 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2017
U.S. locations: 1
States / cities: Birmingham, Alabama

Conditions: Systemic Lupus Erythematosus
Interventions: Cholecalciferol; Drug
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 18 Years to 85 Years
Enrollment: 18 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2006 – 2014
U.S. locations: 1
States / cities: Charleston, South Carolina

Conditions: Osteopenia
Interventions: Oral calcitonin at dinnertime, Oral placebo at dinnertime, Oral calcitonin at bedtime, Oral placebo at bedtime; Drug
Lead sponsor: Tarsa Therapeutics, Inc.; Industry
Eligibility: 45 Years and older · Female only
Enrollment: 129 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2012
U.S. locations: 10
States / cities: Walnut Creek, California • Clearwater, Florida • Bethesda, Maryland + 7 more

Conditions: Colorectal Cancer, Polyps, Adenomas
Interventions: Calcium Carbonate, Vitamin D3, placebo; Drug
Lead sponsor: Dartmouth-Hitchcock Medical Center; Other
Eligibility: 45 Years to 75 Years
Enrollment: 2,813 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2004 – 2016
U.S. locations: 10
States / cities: Los Angeles, California • Denver, Colorado • Atlanta, Georgia + 7 more

Conditions: Vitamin D Deficiency, Hypovitaminosis A, Vitamin E Deficiency
Interventions: Vitamin D, Vitamin D, Vitamin E, and Vitamin A, Control, 700 mg Calcium; Dietary Supplement
Lead sponsor: Boston University; Other
Eligibility: 6 Years to 10 Years
Enrollment: 180 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2005 – 2008
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Cardiovascular Disease
Interventions: Cholecalciferol, Placebo; Dietary Supplement
Lead sponsor: Creighton University; Other
Eligibility: 19 Years and older
Enrollment: 24 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2015
U.S. locations: 2
States / cities: Omaha, Nebraska

Conditions: Chronic Kidney Disease, Secondary Hyperparathyroidism, Vitamin D Insufficiency
Interventions: Cohort 1 CTAP101 Capsules- 60µg, Cohort 1 CTAP101 Capsules - 90µg, Cohort 1 Matching Sugar Capsule, Cohort 2 CTAP101 Capsules - 30µg, Cohort 2 Matching Sugar Capsule; Drug
Lead sponsor: OPKO Health, Inc.; Industry
Eligibility: 18 Years to 85 Years
Enrollment: 78 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Bannockburn, Illinois

Conditions: Nonmelanoma Skin Cancer, Basal Cell Carcinoma, Squamous Cell Carcinoma
Interventions: Vitamin D (VitD), Placebo, Photodynamic therapy (PDT), Mohs surgery or electrodessication & curettage (ED&C) (standard of care); Dietary Supplement · Other · Procedure
Lead sponsor: Case Comprehensive Cancer Center; Other
Eligibility: 18 Years and older
Enrollment: 54 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2026 – 2027
U.S. locations: 1
States / cities: Cleveland, Ohio

Conditions: Bone Health, Nutrition Status
Interventions: Ca/Vit D, Placebo; Dietary Supplement · Other
Lead sponsor: United States Army Research Institute of Environmental Medicine; Federal
Eligibility: 17 Years to 42 Years
Enrollment: 342 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2018
U.S. locations: 2
States / cities: Fort Sill, Oklahoma • San Antonio, Texas

Conditions: Post Menopausal Osteoporosis
Interventions: Placebo, Vitamin D and calcium supplementation, ibandronate [Bonviva/Boniva]; Drug
Lead sponsor: Hoffmann-La Roche; Industry
Eligibility: 65 Years and older · Female only
Enrollment: 67 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2006 – 2007
U.S. locations: 7
States / cities: Beverly Hills, California • La Jolla, California • Augusta, Georgia + 4 more

Conditions: Vitamin D Deficiency, Coronary Artery Disease, Endothelial Dysfunction, Inflammation
Interventions: Ergocalciferol, Sugar pill; Drug · Other
Lead sponsor: Seth I. Sokol, M.D.; Other
Eligibility: 18 Years and older
Enrollment: 96 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2011
U.S. locations: 2
States / cities: The Bronx, New York

Conditions: Atopic Dermatitis, Eczema, DNA
Interventions: DNA reports, Information reports; Behavioral
Lead sponsor: Studies&Me; Industry
Eligibility: 18 Years and older
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020 – 2021
U.S. locations: 1
States / cities: Redwood City, California

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VITAL-DEP: Depression Endpoint Prevention in the VITamin D and OmegA-3 TriaL

A Phase III Study to Investigate if the Study Drug Diamyd Can Preserve Insulin Production and Improve Glycemic Control in Patients Newly Diagnosed With Type 1 Diabetes

Effects of Vitamin D on Lipids

A Study in Adult Patients With Type I, III or IV Osteogenesis Imperfecta Treated With BPS804

Low vs. Moderate to High Dose Vitamin D for Prevention of COVID-19

Management of Mineral and Bone Disease in Hemodialysis-Calcitriol vs. Paricalcitol

Cholecalciferol and Flu Vaccine in Treating Healthy Participants

PK and PD Study of Calcitriol 3 mcg/g Ointment in Pediatric Subjects With Plaque Psoriasis

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

Vitamin D for Painful Nocturnal Leg Cramps

A Clinical Study to Evaluate the Efficacy of Four Supplements on Improving Readiness for Intimacy

Intralesional Vitamin D Injection for Treatment of Common Warts

Vitamin D Receptor Polymorphisms and Non-Melanoma Skin Cancer Risk

Vitamin D Therapy in Patients With Systemic Lupus Erythematosus (SLE)

A Study of Oral Recombinant Salmon Calcitonin (rsCT) to Prevent Postmenopausal Osteoporosis

Vitamin D/Calcium Polyp Prevention Study

A Randomized Controlled Trial Testing The Effect Of A Multi-Nutrient Fortified Juice

Role of Vitamin D in Secondary Prevention of Cardiovascular Events

Safety/Efficacy Study of CTAP101 in Chronic Kidney Disease Subjects With Secondary Hyperparathyroidism (SHPT)

Vitamin D Effects on Immune Microenvironment of Nonmelanoma Skin Cancer After Photodynamic Therapy (PDT)

Optimizing Vitamin D Status During Initial Military Training

A Study of Bone Turnover Markers in Post-Menopausal Women With Osteoporosis Treated With Monthly Boniva (Ibandronate)

Vitamin D Repletion in Coronary Artery Disease

Using a Telemedicine Approach in a Genome-wide Association Study of Atopic Dermatitis - Searching for Novel Biomarkers in Clinically Relevant Phenotypes