Clinical trials: Vitamin D Status
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
Osteopenia, Vitamin D Deficiency
Bone Health and Vitamin D Status
This study will compare and assess the prevalence of osteopenia and vitamin D deficiency as well as effects of TDF on the patients' bone among HIV positive and negative patients.
- Conditions
- Osteopenia, Vitamin D Deficiency, HIV Infection
- Trial name
- BHVD (NCT01634607)
- Where
- Thailand
- Volunteers
- 235 people, healthy volunteers welcome
- Sponsor
- Thai Red Cross AIDS Research Centre
Nutrition Status, Bone Health
Evaluation of Calcium and Vitamin D Supplementation During Marine Corps Training
The primary objective of this randomized, double-blind, placebo-controlled trial is to determine the efficacy and effectiveness of Ca and vitamin D supplementation provided daily throughout Marine Corps recruit training on…
- Trial name
- MCRD-PI (NCT02636348)
- Testing
- Calcium/Vitamin D
- Where
- United States
- Volunteers
- 380 people, healthy volunteers welcome
- Sponsor
- United States Army Research Institute of Environmental Medicine
Nutrition Status, Nutritional Requirements
Effects of Vitamin D on Skeletal Muscle Strength in Resistance Trained Adult Females
The majority of vitamin D research has been done in non-athletic populations, particularly older populations, to analyze muscle weakness, pain, balance, and fractures.
- Conditions
- Nutrition Status, Nutritional Requirements, Sports Nutritional Sciences
- Trial name
- NCT05489666
- Testing
- Nature Made Vitamin D3 5,000 IU, 125mcg
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Auburn University
Hidradenitis Suppurativa, Mediterranean Diet
Nutritional Status and Hidradenitis Suppurativa (Acne Inversa)
Hidradenitis suppurativa (HS) is a chronic inflammatory, debilitating skin disorder. The exacerbating factors of HS include nutrition and adiposity.
- Conditions
- Hidradenitis Suppurativa, Mediterranean Diet, Body Composition, Vitamin D Deficiency
- Trial name
- NutriHidra (NCT03683238)
- Testing
- Mediterranean Diet
- Volunteers
- 81 people, healthy volunteers welcome
- Sponsor
- Federico II University
Bone Health, Nutrition Status
Optimizing Vitamin D Status During Initial Military Training
The primary objective of this randomized, double-blind, placebo-controlled trial is to determine the effect of vitamin D and calcium supplementation (800IU and 2000mg, respectively) on biochemical indicators of nutritional status…
- Trial name
- NCT01617109
- Testing
- Ca/Vit D
- Where
- 2 sites in United States
- Volunteers
- 342 people, healthy volunteers welcome
- Sponsor
- United States Army Research Institute of Environmental Medicine
Healthy
Vitamin D Supplementation During Pregnancy and Bone Status in Children at Birth and at One Year of Age
Vitamin D deficiency is frequently reported in pregnant women despite recommendation of daily vitamin D supplementation of 400IU/d.
- Trial name
- NCT01060735
- Testing
- Vitamin D
- Where
- Israel
- Volunteers
- 120 people, healthy volunteers welcome
- Sponsor
- Rabin Medical Center
Vitamin D Status
The Vitamin D Dose-Response Relationship
The purpose of the study is to determine the importance of the UV intensity and the UVB dose on the Vitamin D response after UVB.
- Trial name
- NCT01074541
- Testing
- UVB
- Where
- Denmark
- Volunteers
- 55 people, healthy volunteers welcome
- Sponsor
- Bispebjerg Hospital
Sub-optimal Vitamin D Status, Pre-diabetes
Effect of Vitamin D3 Supplementation on Insulin Resistance- The DIR Study
Insulin resistance is a state where the body does not respond as it should to the insulin it produces. Individuals who are insulin resistant are at increased risk of both heart disease and type 2 diabetes; importantly, diabetes…
- Conditions
- Sub-optimal Vitamin D Status, Pre-diabetes, Insulin Resistance
- Trial name
- NCT01889810
- Testing
- Vitamin D3 supplementation
- Where
- United Kingdom
- Volunteers
- 81 people, healthy volunteers welcome
- Sponsor
- Queen's University, Belfast
Hypovitaminosis D, Deficiency of Micronutrients
Investigation of Vitamin D3 Enriched, Reduced-fat Yellow Cheese Efficacy to Prevent Vitamin D Deficiency
The primary aim of the current study was to investigate whether the consumption of vitamin D3 enriched, reduced-fat yellow cheese can counterbalance the expected decrease in serum 25-hydroxyvitamin D concentration during winter…
- Trial name
- NCT02543671
- Testing
- vitamin D3 enriched, reduced-fat yellow cheese, plain (non-fortified) reduced-fat yellow cheese
- Where
- Greece
- Volunteers
- 80 people, healthy volunteers welcome
- Sponsor
- Harokopio University
Muscle Function, Muscle Soreness
Vitamin D2, Muscle Damage, NASCAR Pitcrew
Hypothesis: Six weeks of supplementation with vitamin D (4000 IU/day) using Dole's Vitamin D Portobello Mushroom Powder will increase winter serum vitamin D levels, and improve muscle function and strength, and innate immunity…
- Conditions
- Muscle Function, Muscle Soreness, Vitamin D Status
- Trial name
- NCT01825616
- Testing
- Vitamin D2 mushroom powder
- Where
- 3 sites in United States
- Volunteers
- 33 people, healthy volunteers welcome
- Sponsor
- Appalachian State University
Multi-drug Resistant Tuberculosis
Case Control Study of Vitamin D Status and Adult Multidrug-resistant Pulmonary Tuberculosis in Maharashtra, India
India has the highest incidence of and mortality from multi-drug resistant tuberculosis (MDR-TB) globally. Vitamin D status may be an important determinant of MDR-TB infection and treatment outcomes; however, observational…
- Trial name
- NCT04342598
- Testing
- Serum Vitamin D
- Where
- India
- Volunteers
- 352 people, healthy volunteers welcome
- Sponsor
- Harvard School of Public Health (HSPH)
Vitamin D Deficiency
The Effect of Vitamin D Supplements on Vitamin D Status, Cardiometabolic Health and Immune Defense in Danish Children
The main purpose of this study is to investigate whether and in which doses vitamin D intake is needed in order to maintain an adequate vitamin D status in 4-8 year-old Danish children during wintertime.
- Trial name
- ODIN Junior (NCT02145195)
- Testing
- Vitamin D3 (cholecalciferol)
- Where
- Denmark
- Volunteers
- 130 people, healthy volunteers welcome
- Sponsor
- University of Copenhagen
Vitamin D3 Deficiency
Preventing Health Disparities During Pregnancy Through Vitamin D Supplementation
The purpose of this study is to give all mothers the best chance for a healthy pregnancy through vitamin D supplementation. We will study women of diverse racial/ethnic backgrounds who will receive either the current vitamin D…
- Trial name
- NCT01932788
- Testing
- Vitamin D3 4000 IU in gummy form
- Where
- United States
- Volunteers
- 342 people, healthy volunteers welcome
- Sponsor
- Medical University of South Carolina
SARS-CoV Infection, Vitamin D Deficiency
Influence of Military Preventive Policy for reCruit Training on COVID-19 Seroconversion
This study is intended to address the association between vitamin D status and seroconversion to SARS-CoV-2 in healthy young adults.
- Conditions
- SARS-CoV Infection, Vitamin D Deficiency, Covid19, Acute Respiratory Tract Infection
- Trial name
- IMPACTCOVID (NCT04476680)
- Testing
- Vitamin D
- Where
- 2 sites in United Kingdom
- Volunteers
- 900 people, healthy volunteers welcome
- Sponsor
- Royal Centre for Defence Medicine
Pregnancy
Antenatal Vitamin D3 Supplementation in Bangladesh: Randomized Controlled Trial
This study is a randomized placebo-controlled trial of oral weekly vitamin D3 (cholecalciferol) supplementation during the third trimester of pregnancy among women in Dhaka, Bangladesh.
- Trial name
- AViDD-2 (NCT01126528)
- Testing
- Vitamin D3
- Where
- Bangladesh
- Volunteers
- 160 people, healthy volunteers welcome
- Sponsor
- Johns Hopkins Bloomberg School of Public Health
Labor, Premature
Correlation Between Vitamin D and B Regulatory Cell in Pregnancy
During pregnancy , the maternal immune system is always confronted with fetal alloantigens. the immunological mechanisms that prevent the rejection of the fetus are still not under understood.
- Trial name
- NCT04105881
- Testing
- Investigation
- Where
- 2 sites in Egypt
- Volunteers
- 90 people, healthy volunteers welcome
- Sponsor
- Assiut University
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
Obesity
Effect of Vitamin D3 Supplementation on Insulin Resistance and Cardiovascular Risk Factors in Obese Adolescents
The prevalence of obesity has reached epidemic proportions nationally as well as internationally. Currently, 16 % of American adolescents are obese.
- Trial name
- NCT00858247
- Testing
- Vitamin D3
- Where
- United States
- Volunteers
- 51 people, healthy volunteers welcome
- Sponsor
- Mayo Clinic
Vitamin D Deficiency
The Effect of Vitamin D3 Therapy on Vitamin D Status in Pregnant Women With Vitamin D Deficient and Insufficient
This study is a randomized controlled trial which compares the effect of vitamin D3 therapy 5,000 IU daily and 50,000 IU on 25(OH)D and 1,25(OH)2D, VDBP, and 24,25(OH)2D maternal serum levels in pregnant women with vitamin D…
- Trial name
- NCT06054919
- Testing
- Cholecalciferol
- Where
- Indonesia
- Volunteers
- 52 people, healthy volunteers welcome
- Sponsor
- Universitas Indonesia