Clinical trials: Vitamin D Concentration
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
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
Insulin Resistance, Obesity
Vitamin D and Glucose Metabolism in Pediatrics
The discovery that the vitamin D receptor is expressed in more than 30 tissues indicates that the physiologic functions of vitamin D are much broader than its well-known role in the regulation of calcium absorption and bone…
- Conditions
- Insulin Resistance, Obesity, Vitamin D25 Insufficiency
- Trial name
- NCT01386736
- Testing
- Vitamin D drops
- Where
- United States
- Volunteers
- 110 people, healthy volunteers welcome
- Sponsor
- Weill Medical College of Cornell University
Compliance, Medication
Medication Adherence Monitoring Trial Using Smart Clinical Trial Application and Smart Watch
The study will investigate the effect of smart monitoring on medication adherence.
- Trial name
- NCT05452512
- Testing
- Self monitoring, Smart watch assisted monitoring, Vitamin D
- Where
- South Korea
- Volunteers
- 16 people, healthy volunteers welcome
- Sponsor
- Seoul National University Hospital
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
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 25-Hydroxylase Deficiency, Vitamin D Deficiency/Insufficiency
Effects of High-Dose Vitamin D on Hormones, Neuromuscular Function, Cognition, and Body Composition in Athletes
This study aims to evaluate the effects of high-dose vitamin D3 supplementation on selected physiological, neuromuscular, and cognitive parameters in athletes.
- Trial name
- NCT07641075
- Testing
- Vitamin D supplementation
- Where
- Poland
- Volunteers
- 200 people, healthy volunteers welcome
- Sponsor
- The Jerzy Kukuczka Academy of Physical Education in Katowice
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
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, 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
- NCT07099586
- Testing
- No Interventions
- Where
- Bosnia and Herzegovina
- Volunteers
- 360 people
- Sponsor
- University of Mostar
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
Cardiovascular Disease, Vitamin D Deficiency
Acute Effect of Systemic Stress on Measured Blood Concentrations of 25 (OH) Vitamin D
Each patient who is admitted for preoperative preparation for elective open heart surgery at Intermountain Medical Center will be invited to participate in this study.
- Trial name
- ASSESS-D (NCT02460211)
- Testing
- Vitamin D3
- Where
- United States
- Volunteers
- 150 people
- Sponsor
- Intermountain Health Care, Inc.
Diabetes Mellitus Type 2, Vitamin D Deficiency
Vitamin D Supplementation in Patients With Diabetes Mellitus Type 2
Background and Objectives : The presence of vitamin D deficiency in patients with type 2 diabetes mellitus (T2DM) is associated with an increased risk of cardiovascular disease (CVD).
- Trial name
- DIMENSION (NCT01741181)
- Testing
- Vitamin D supplementation
- Where
- Singapore
- Volunteers
- 64 people
- Sponsor
- Tan Tock Seng Hospital
25-hydroxyvitamin D Concentration (Vitamin D Status)
D-Light Intervention
Vitamin D insufficiency has become a global concern, with low vitamin D status associated with bone disorders, cardiovascular disease and certain cancers.
- Trial name
- D-Light (NCT02495584)
- Testing
- Fortified milk (10µg vitamin D3), 10µg vitamin D3 supplement
- Where
- United Kingdom
- Volunteers
- 52 people, healthy volunteers welcome
- Sponsor
- University of Ulster
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
Vitamin D Deficiency, Musculoskeletal Diseases
Vitamin D in School Children
The primary purpose of this study it to investigate total circulating 25-hydroxyvitamin D (25(OH)D) in school children (aged 4-11years) in Northern Ireland; thereby establishing the prevalence of vitamin D status (deficiency…
- Conditions
- Vitamin D Deficiency, Musculoskeletal Diseases, Cognitive Delay, Mild
- Trial name
- DVinCHI (NCT05018988)
- Testing
- Oral vitamin D spray
- Where
- United Kingdom
- Volunteers
- 118 people, healthy volunteers welcome
- Sponsor
- University of Ulster
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
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
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
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