Clinical trials: Vitamin D Concentration
Chronic Kidney Diseases, Osteodystrophy
Effect of Allopurinol on Markers of Mineral and Bone Metabolism
Hyperuricemia is a common condition in patients with chronic kidney disease (CKD) in the glomerular filtration rate. Recently, it has been suggested that uric acid is related to a mineral and bone disease of CKD (CKD-MBD) since…
- Conditions
- Chronic Kidney Diseases, Osteodystrophy, Uric Acid Concentration, Serum, Quantitative Trait Locus 7
- Trial name
- NCT05601271
- Testing
- Allopurinol
- Where
- Brazil
- Volunteers
- 50 people
- Sponsor
- University of Sao Paulo General Hospital
Serum 25-hydroxyvitamin D Concentrations (25OHD)
The BreaD Study - Bio-availability of D2 Vitamin Present in Bread
Vitamin D3 is synthesized in skin exposed to ultraviolet-B-irradiation of sunlight. However, in Northern Europe, including Finland, exposure to sunlight is limited or non-existent in winter.
- Trial name
- BreaD_ODIN (NCT02525003)
- Testing
- Vitamin D2, Vitamin D3, Vitamin D2 fortified bread
- Where
- Finland
- Volunteers
- 41 people, healthy volunteers welcome
- Sponsor
- University of Helsinki
Locally Advanced Cervical Cancer, Vitamin D Concentration
Vitamin D Status and Clinical Outcomes in Locally Advanced Cervical Cancer
Background. Definitive chemoradiotherapy represents the standard therapeutic approach for the management of locally advanced cervical cancer.
- Trial name
- CERVITAL (NCT07743918)
- Testing
- Pretreatment Vitamin D Assessment in Serum and Cervical Lavage Fluid
- Where
- Serbia
- Volunteers
- 100 people
- Sponsor
- University of Kragujevac
Vitamin D Concentration
Vitamin D Satus in Adults With Newly Diagnosed ITP
Investigator study aims to assess the level of vitamin D in adult patients with newly diagnosed ITP and correlation between its level and treatment respose
- Trial name
- NCT07146555
- Testing
- No Interventions
- Volunteers
- 84 people, healthy volunteers welcome
- Sponsor
- Assiut University
25-hydroxyvitamin D Serum Concentrations
Trial of Vitamin D Fortified Milk
Prevalence of VDD is high worldwide, even in sunbathed equatorial regions where it had not been suspected before. The most cost-effective method for reducing population-wide VDD is through fortification of commonly consumed…
- Trial name
- NCT01909622
- Testing
- Vitamin D, No vitamin D
- Where
- 2 sites in Colombia
- Volunteers
- 80 people
- Sponsor
- University of Michigan
Osteomalacia
Serum FGF-23 and Vitamin D Deficiency
We aimed to determine the effect of vitamin D replacement therapy on serum FGF-23 concentrations in vitamin D deficient women and to compare the FGF-23 concentrations of vitamin D deficient patients with healthy subjects and…
- Trial name
- NCT01102751
- Where
- Turkey (Türkiye)
- Volunteers
- healthy volunteers welcome
- Sponsor
- Istanbul University
Vitamin D Deficiency
Effect of Vitamin D on Everolimus Trough Concentrations Among Heart Transplanted Patients
Vitamin D is part of the regular treatment regimen among patients after heart transplantation. Due to potential drug-drug interaction between vitamin D and everolmus, these patients are in increased risk for increased everolimus…
- Trial name
- NCT03403647
- Testing
- Vitamin D
- Where
- Israel
- Volunteers
- 11 people
- Sponsor
- Sheba Medical Center
ADHD
Vitamin D as a Therapeutic Adjunct in the Stimulant Treatment of ADHD
Specific Aim 1: As part of a within-subject, two-days, study design, to determine whether acute calcitriol (vs. placebo) pre-treatment is associated with greater amphetamine (Amp)-induced dopamine (DA) release in the caudate…
- Trial name
- NCT03103750
- Testing
- Magnetic Resonance Imaging (MRI), PHNO, calcitriol
- Where
- United States
- Volunteers
- 24 people, healthy volunteers welcome
- Sponsor
- Yale University
Vitamin D Deficiency
Vitamin D Serum Concentrations & Supplementation in Children With Cerebral Palsy
The purpose of this study is to try to correlate vitamin D dosing and dosing adjustment with Vitamin D levels, measure affects of seizure medications on levels as well as pathologic fractures and bone density in severely…
- Trial name
- NCT01926808
- Volunteers
- 115 people
- Sponsor
- Akron Children's Hospital
Vitamin D Deficiency
A Single Wintertime Dose of Vitamin D3 to Prevent Winter Decline in Vitamin D Status in Healthy Adults
The purpose of this study is to determine if a single dose of vitamin D administered orally in the fall will provide adequate vitamin D in healthy individuals for the duration of the winter, during which vitamin D levels are…
- Trial name
- NCT01924910
- Testing
- 250,000 IU cholecalciferol as single, oral dose
- Where
- United States
- Volunteers
- 28 people, healthy volunteers welcome
- Sponsor
- Emory University
Melatonin, Breast Cancer Patients Diagnosed
Cardioprotective Effect of Melatonin Versus Vitamin D in Breast Cancer Patients Receiving Doxorubicin
This study aims to assess the cardioprotective effect of melatonin and vitamin D in breast cancer patients who receive doxorubicin.
- Conditions
- Melatonin, Breast Cancer Patients Diagnosed, Vitamin D Concentration, Doxorubicin
- Trial name
- NCT07349459
- Testing
- Group 1 (Doxorubicin group), Group 2: Vitamin D group, Group 3: melatonin group
- Where
- Egypt
- Volunteers
- 90 people
- Sponsor
- Tanta University
Vitamin D Deficiency
Immunologic Action of a Single Dose Cholecalciferol
Vitamin D receptors are expressed in activated different immune cells. It is not known, which immune cell type is targeted by exogenous vitamin D. Here, vitamin D-deficient individuals will receive once 100.000 I.U.
- Trial name
- ViDImmun (NCT01845142)
- Testing
- single administration of 100.000 I.U. vitamin D
- Where
- Germany
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Margitta Worm
Homocystinaemia, Vitamin D Deficiency
Vitamin D3 Treatment and Homocysteine Concentrations Among Overweight Reproductive Women
100 overweight reproductive vitamin D deficient women were divided into two groups; vitamin D (n = 50) and placebo (n = 50). Vitamin D group received treatment dose of 50,000 IU of vitamin D3 per week for 2 consecutive months and…
- Trial name
- NCT03310307
- Testing
- Vit D
- Where
- Jordan
- Volunteers
- 100 people, healthy volunteers welcome
- Sponsor
- Al-Balqa Applied University
Serum 25-hydroxyvitamin D Concentrations (25OHD)
Dietary Requirement for Vitamin D in Adolescents Aged 14-18 Years
It is known that low vitamin D status is a very common problem in the UK. It is also known that a lack of vitamin D availability has potentially serious health implications, especially with respect to bone and muscle function.
- Trial name
- NCT02150122
- Testing
- Vitamin D3
- Where
- United Kingdom
- Volunteers
- 120 people, healthy volunteers welcome
- Sponsor
- University of Surrey
Vitamin D, Vitamin B 12 and Folic Acid Concentrations, Micronutrient Status in Women of Reproductive Age
Vitamin B12, Folic Acid and Vitamin D Status in Women of Reproductive Age
This cross-sectional observational study aims to assess serum concentrations of vitamin B12, folic acid, and vitamin D in women of reproductive age in Herzegovina.
- Conditions
- Vitamin D, Vitamin B 12 and Folic Acid Concentrations, Micronutrient Status in Women of Reproductive Age, Vitamin Status Assessment
- Trial name
- NCT07100795
- Testing
- No Interventions
- Where
- Bosnia and Herzegovina
- Volunteers
- 360 people, healthy volunteers welcome
- Sponsor
- University of Mostar
Vitamin D, Acute Exercise
The Effect of an Acute Bout of Exercise on Serum Vitamin D Concentration
Vitamin D deficiency is considered a public health priority in the UK, with approximately 30-40% of the UK population being deemed vitamin D deficient during winter months.
- Trial name
- NCT05214027
- Testing
- Treadmill-Based Exercise (60% VO2 Max for 60 minutes), Rest (60 minutes)
- Where
- United Kingdom
- Volunteers
- 34 people, healthy volunteers welcome
- Sponsor
- University of Bath
Infant, Premature, Diseases
Calcium (ca),Phosphorus( P) and 25-hydroxyvitamin D(25OHD)] in Infants Born ≤ 32 PMA Gestational Weeks (GA)
It has not yet been established the optimal dose of vit. D for preterm infants in Poland. It is not known what dose of vit. D will provide the correct concentration of vit.
- Trial name
- Ca-P (NCT03691896)
- Testing
- Cholecalciferol 400, Cholecalciferol 800, Cholecalciferol 1200
- Where
- Poland
- Volunteers
- 200 people
- Sponsor
- Centre of Postgraduate Medical Education
Chronic Periodontitis
Relationship Between Chronic Periodontitis and Vitamin D and Calcium in Men
Objective: The objective was to evaluate whether serum vitamin D and calcium concentrations are associated with chronic periodontitis in Syrian men Methods: This study designed as "Matched Case-Control Study".200 males will be…
- Trial name
- NCT02127346
- Where
- Syria
- Volunteers
- 200 people, healthy volunteers welcome
- Sponsor
- Damascus University
Vitamin D Receptor Target Gene Expression, Serum 25(OH)D Concentration
Efficiency of Vitamin D3 and 25-hydroxyvitamin D3 on Transcriptomic Changes of Low Vitamin D Responders
The purpose of the study is to investigate in vivo whether a high-dose vitamin D3 oral bolus (2000 micrograms) produces marked vitamin D receptor target gene expression response and whether there is large inter-individual…
- Trial name
- VitDHiD (NCT03537027)
- Testing
- Vitamin D3
- Where
- Finland
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- University of Eastern Finland
Low 25-hydroxyvitamin D Concentrations
A Pilot Study to Examine the Effects of Vitamin D Supplementation on Mitochondrial Bioenergetics in Older Adults
This pilot study is a 4-month open label trial in 15 older (65-89 yrs) men and women with initial 25(OH)D concentrations of 12-<18 ng/mL to explore the effect of increasing 25(OH)D concentrations to ≥30 ng/mL through vitamin D3…
- Trial name
- NCT02445066
- Testing
- Vitamin D3
- Where
- United States
- Volunteers
- 15 people
- Sponsor
- Wake Forest University Health Sciences