Drug or intervention
Vitamin D3 Clinical Trials
Studies that test Vitamin D3, alone, with other treatments or as the comparison.
In numbers
Open to volunteers: recruiting, not yet recruiting or enrolling by invitation. Active adds studies under way that have stopped recruiting.
Open to volunteers
All 49Iron Deficiency Anemia
Effect of Vitamin D Supplementation Added to Iron Therapy in Children With Iron Deficiency Anemia
This randomized controlled trial will evaluate the effect of two vitamin D3 supplementation regimens, administered in addition to oral iron therapy, on hematological and iron status in children aged 6-60 months with confirmed…
- Trial name
- NCT07892170
- Testing
- Elemental iron, Vitamin D3 2000 IU/day, Vitamin D3 400 IU/day
- Where
- Iraq
- Volunteers
- 120 people
- Sponsor
- AlFayhaa General Hospital
Hypovitaminosis D
The Effectiveness of a Weight-dependent Algorithm for Dosing Vitamin D.
Vitamin D is essential for calcium absorption and bone growth, brain development, and immune system function. Vitamin D is produced by the body in response to natural sunlight.
- Trial name
- NCT07876843
- Testing
- Vitamin D3, Calcium, and Vitamin C
- Where
- United States
- Volunteers
- 200 people, healthy volunteers welcome
- Sponsor
- Atlantic Health System
Dental Implant
Effect of Vitamin D3 Supplementation on Serum Sphingosine-1-Phosphate Levels and Dental Implant Osseointegration: A Prospective Study
This study aims to evaluate whether vitamin D3 supplementation can promote dental implant osseointegration by increasing serum sphingosine-1-phosphate (S1P) levels.
- Trial name
- NCT07883811
- Testing
- Vitamin D3 ( Colecalciferol)
- Volunteers
- 60 people
- Sponsor
- Air Force Military Medical University, China
Localized Prostate Carcinoma, Stage IV Prostate Cancer AJCC v8
Immunological Effects of Vitamin D Replacement Among Black/African American Prostate Cancer Patients
This early phase I is to find out how common vitamin D insufficiency is among African American patients with a history of prostate cancer that has not spread to other parts of the body (localized) or has spread to other places in…
- Conditions
- Localized Prostate Carcinoma, Stage IV Prostate Cancer AJCC v8, Locally Recurrent Prostate Carcinoma, Metastatic Prostate Carcinoma
- Trial name
- NCT05045066
- Testing
- Cholecalciferol, Quality-of-Life Assessment, Biospecimen Collection
- Where
- 2 sites in United States
- Volunteers
- 220 people
- Sponsor
- Mayo Clinic
Healthy Adult Participants, Vitamin D Insufficiency
Supplementation of Cholecalciferol and Related Active Metabolites Through Bioenhancing Layer's Eggs
The purpose of this research is to evaluate if 1) consumption of vitamin D3- or 25(OH)D3-biofortified eggs will increase vitamin D and 25(OH)D status in young adults who consume these bioenhanced eggs, 2) to determine if the gut…
- Trial name
- SCRAMBLE (NCT07859280)
- Testing
- Vitamin D3 bioenhanced eggs, 25(OH)D3 bioenhanced eggs
- Where
- United States
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- Cornell University
Accelerated Orthodontic Tooth Movement
Comparing MOP, Prostaglandin E1, and Calcitriol to Accelerate Orthodontic Tooth Movement
This study will compare the effects of MOP (micro-osteoperforation), prostaglandin E1, and calcitriol on the rate of orthodontic tooth movement.
- Trial name
- acceleration (NCT07842120)
- Testing
- PGE₁ (pharmacological) • Agent: Prostaglandin E1, Calcitriol (1,25-(OH)₂D₃) local injection • Agent: Calcitriol (1,25-(OH)₂D₃) Vitamin D3, microosteoperforation MOP (surgical)
- Where
- 2 sites in Iraq
- Volunteers
- 60 people
- Sponsor
- Ghufran Dhari Awad
Advanced Hepatocellular Carcinoma, Advanced Melanoma
Multiple Adjunct Therapies to Improve Immunotherapy Treatment in Patients With Locally Advanced or Metastatic Melanoma or Advanced Hepatocellular Cancer
This clinical trial tests the effect of multiple therapies (propranolol, desloratadine, and magnesium and vitamin D supplements) added to primary standard of care immunotherapy (adjunct), as well as adjusting the timing of…
- Conditions
- Advanced Hepatocellular Carcinoma, Advanced Melanoma, Locally Advanced Melanoma, Metastatic Melanoma
- Trial name
- NCT07836712
- Testing
- Biospecimen Collection, Cholecalciferol, Computed Tomography
- Where
- United States
- Volunteers
- 46 people
- Sponsor
- University of Southern California
Acute Stress Reaction
The Efficacy of Vitamin D Supplementation to Sustain Performance Outcomes
The goal of this clinical trial is to find out if vitamin D supplements help healthy adults maintain their cognitive and simple physical task performance and emotional state during highly stressful situations.
- Trial name
- NCT07654777
- Testing
- Vitamin D3 (Cholecalciferol)
- Where
- United States
- Volunteers
- 52 people, healthy volunteers welcome
- Sponsor
- Walter Reed Army Institute of Research (WRAIR)
Healthy Volunteer
Supplementation Absorption Comparison
The goal of this interventional study is to compare the absorption of supplements with and without absorption enhancing technology in healthy volunteers.
- Trial name
- PHAABS (NCT07791797)
- Testing
- Aquacelle® Omega 3, Comparator Omega 3, Plexosome® Vitamin D3
- Where
- Australia
- Volunteers
- 160 people, healthy volunteers welcome
- Sponsor
- RDC Clinical Pty Ltd
Infant Vitamin K Status, Vitamin K Deficiency Bleeding
The OK Daily Study
The OK Daily Study is a multi-centred, part-randomised, part blinded, four cohort study. We are exploring daily dietary supplementation with vitamin K2, specifically menaquinone-7 (MK-7), given to breastfed infants or…
- Trial name
- NCT07620236
- Testing
- Combined MK-7 + vitamin D3 drops, Vitamin D3 Drops, MK-7 capsules
- Volunteers
- 134 people, healthy volunteers welcome
- Sponsor
- Norfolk and Norwich University Hospitals NHS Foundation Trust
Completed, with results posted
All –Male Osteoporosis
Novel Combination Therapy for Osteoporosis in Men
Osteoporotic fractures are a key health problem in older men. Although there are drugs approved to treat osteoporosis in men [bisphosphonates, denosumab, and teriparatide (TPTD) or PTH(1-34)], there is a lack of knowledge on how…
- Trial name
- Osteo-Men (NCT03994172)
- Testing
- Teriparatide or human parathyroid hormone (PTH) 1-34, Cinacalcet, Calcium citrate tablet
- Where
- United States
- Volunteers
- 40 people
- Sponsor
- VA Office of Research and Development
SARS-CoV-2 Infection
Low vs. Moderate to High Dose Vitamin D for Prevention of COVID-19
The purpose of this study is to compare the risks of COVID-19 in individuals from Chicagoland communities randomized to low (400 IU/day) vs. moderate (4,000 IU/day) or high (10,000 IU/day) dose vitamin D.
- Trial name
- NCT04868903
- Testing
- Vitamin D3
- Where
- 2 sites in United States
- Volunteers
- 1,475 people, healthy volunteers welcome
- Sponsor
- University of Chicago
Human Immunodeficiency Virus (HIV)
Vitamin D3 Supplementation in Patients With HIV: Effects on Interleukin-6 Levels and CD4 Counts
This study aims to evaluate the effect of Vitamin D3 supplementation on inflammatory markers and immune status in patients with HIV who are receiving antiretroviral therapy.
- Trial name
- NCT07553052
- Testing
- Vitamin D3, Antiretroviral (ARV) medications
- Where
- Indonesia
- Volunteers
- 20 people
- Sponsor
- Universitas Sebelas Maret
Asthma
Randomized Trial: Maternal Vitamin D Supplementation to Prevent Childhood Asthma (VDAART)
Vitamin D supplementation given to pregnant women will prevent asthma in their offspring and children.
- Trial name
- VDAART (NCT00920621)
- Testing
- Vitamin D 3 cholecalciferol, Vitamin D3
- Where
- 3 sites in United States
- Volunteers
- 876 people, healthy volunteers welcome
- Sponsor
- Brigham and Women's Hospital
Bone Density, Body Composition
VITamin D and OmegA-3 TriaL: Effects on Bone Structure and Architecture (VITAL)
The VITamin D and OmegA-3 TriaL (VITAL; NCT 01169259) is a randomized clinical trial in 25,871 U.S. men and women investigating whether taking daily dietary supplements of vitamin D3 (2000 IU) or fish oil (1 gram of omega-3 fatty…
- Conditions
- Bone Density, Body Composition, Bone Health
- Trial name
- VITAL (NCT01747447)
- Testing
- omega-3 fatty acids (fish oil), Vitamin D3
- Where
- United States
- Volunteers
- 771 people, healthy volunteers welcome
- Sponsor
- Brigham and Women's Hospital