Clinical trials: Vitamin D Concentration
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
Serum 25-hydroxyvitamin D Concentrations (25OHD)
Marwo-D Research -Need for Vitamin D in Different Population Groups
Insufficient intake of vitamin D is a public health problem, affecting about 40% of the Finnish population in the winter. Vitamin D has a wide range of health effects: in addition to its effect on bone, it is known to affect…
- Trial name
- ODIN (NCT02212223)
- Testing
- Vitamin D3
- Where
- Finland
- Volunteers
- 147 people, healthy volunteers welcome
- Sponsor
- University of Helsinki
Vitamin D Deficiency, 25-Hydroxyvitamin D Concentration
Is Vitamin D2 Treatment-associated Decrease in 25(OH)D3 Level a Reciprocal Phenomena?
Several studies have demonstrated that D2 treatment is associated with a decrease in 25(OH)D3 level and therefore have proposed that D3 would be preferable in term of raising total 25(OH)D level.
- Trial name
- NCT03035084
- Testing
- Vitamin D3, Vitamin D2
- Where
- Saudi Arabia
- Volunteers
- 100 people, healthy volunteers welcome
- Sponsor
- King Faisal Specialist Hospital & Research Center
Vitamin D Deficiency, Cardiometabolic Risk Factors
Comparison of Sunlight Exposure and Vitamin D Supplementation on Serum 25-hydroxyvitamin D Levels
This study aimed to compare the effects between sunlight exposure and oral vitamin D supplementation on serum 25-hydroxyvitamin D concentration and metabolic markers in Korean young adults.
- Trial name
- NCT03310242
- Testing
- Sunlight Exposure, Vitamin D Supplementation
- Volunteers
- 150 people, healthy volunteers welcome
- Sponsor
- Seoul National University 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
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
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
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
Inflammation
Effect of a One Time Dose of Cholecalciferol on Serum Concentration of 25-Hydroxyvitamin D and Macrophages
Optimal Vitamin D dosing to obtain adequate serum concentrations of 25-hydroxyvitamin D (25OHD) is controversial. The optimal dose and dosing interval is unknown, and the tendency over the last few years is to give higher, less…
- Trial name
- NCT02920502
- Testing
- Arm 2: cholecalciferol 50,000 IU, Arm 3: cholecalciferol 100,000 IU, Arm 4: cholecalciferol 200,000 IU
- Where
- United States
- Volunteers
- 24 people, healthy volunteers welcome
- Sponsor
- University Hospitals Cleveland Medical Center
Vitamin D Concentration, Vitamin D Status
A Comparison of Capsules and Oral Spray Solution as Methods of Delivering Vitamin D3 and Raising Status
The aim of the study is to compare the effectiveness of a vitamin D3 oral spray solution with capsules at raising vitamin D status over winter.
- Trial name
- SCD3 (NCT02608164)
- Testing
- 3000IU(75μg) vitamin D3
- Where
- United Kingdom
- Volunteers
- 22 people, healthy volunteers welcome
- Sponsor
- University of Ulster
Vitamin D Deficiency
Comparison of Changes in Serum 25(OH)D Concentrations Following Vitamin D Supplementation With Chewable Tablets Versus Pills
This is a 6-month cross-over trial of vitamin D supplementation in 38 healthy men and women aged 18 years and older. The primary aim is to compare the change in serum 25(OH)D concentration following vitamin D supplementation with…
- Trial name
- NCT02158598
- Testing
- Vitamin D chewable tablet supplementation, Vitamin D pill supplementation
- Where
- Canada
- Volunteers
- 38 people, healthy volunteers welcome
- Sponsor
- CHU de Quebec-Universite Laval
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
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
Phosphate Diabetes, X-linked Hypophosphatemia
Phosphorus-31 Spectroscopy in Phosphate Diabetes
Phosphate diabetes is defined by urinary phosphate wasting due to impaired tubular reabsorption. It can be classified based on either a genetic or acquired origin.
- Trial name
- Phos-ATP (NCT06921720)
- Testing
- intra-muscular ATP values in phosphate diabetes, intra-muscular phosphate values in phosphate diabetes
- Where
- 2 sites in France
- Volunteers
- 65 people, healthy volunteers welcome
- Sponsor
- Hospices Civils de Lyon
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
Healthy Individuals
Study of Vitamin D Fortification of Milk and Oil
It is a two-year longitudinal effectiveness study. A comparative study with a case-control design. Study will be conducted in Pune city. A total of up to 100 families (50 families per group) will be recruited.
- Trial name
- Tata (NCT05541094)
- Where
- India
- Volunteers
- 448 people, healthy volunteers welcome
- Sponsor
- Dr. Anuradha Khadilkar
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
Healthy
Vitamin D Production Levels Achieved by Sunbed Tanning
Health Canada's Radiation Emitting Devices (RED) Act provides exposure time guidelines for sunbed use. These guidelines are intended to protect sunbed users from overexposure to UV radiation.
- Trial name
- NCT02334592
- Testing
- Sunbed tanning
- Volunteers
- 87 people, healthy volunteers welcome
- Sponsor
- Vitamin D Society
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
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