Clinical trials: Vitamin D Status
Cognitive Decline, Cognitive Impairment
Serum, Dietary and Supplemental Vitamin D's Association With Cognitive Decline
Serum 25(OH)D, dietary and supplemental vitamin D were shown to influence cognitive outcomes in large epidemiological studies. Sex/age-specific and race-specific associations of vitamin D status and intake were examined with…
- Trial name
- NCT03320109
- Testing
- Vitamin D
- Where
- United States
- Volunteers
- 3,720 people, healthy volunteers welcome
- Sponsor
- National Institute on Aging (NIA)
Infertility, Female
Effects of Vitamin D Status on the Outcome of Ivf - Embryo Transfer
At present, there is no agreement on the effect of vitamin D level in serum and follicular fluid on the outcome of IVF-ET pregnancy.
- Trial name
- NCT03503006
- Where
- China
- Volunteers
- 2,569 people
- Sponsor
- Reproductive & Genetic Hospital of CITIC-Xiangya
Vitamin D Deficiency
Vitamin D Supplementation of Lactating Mothers
The investigators would like to test the hypothesis that maternal vitamin D supplementation during lactation in dose 1200IU/d (400IU from multivitamins + 800 IU cholecalciferol) is more effective than 400IU/d (400IU from…
- Trial name
- MAVID (NCT01506557)
- Testing
- cholecalciferol
- Where
- 5 sites in Poland
- Volunteers
- 174 people, healthy volunteers welcome
- Sponsor
- Children's Memorial Health Institute, Poland
Vitamin D Deficiency
Environmental & Genetic Influences on Vitamin D Status
The purpose of this study is to determine the effect of environmental and genetic influences on Vitamin D status.
- Trial name
- NCT01208636
- Where
- United States
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Creighton University
Deficiency, Vitamin D
Vitamin D Status After Single Oral Dose of Cholecalciferol in Low Fat Meal Compared to High-fat Meal
The purpose of this study is to evaluate the absorption of dietary supplement of vitamin D3 (cholecalciferol), through the variation of 25 (OH) D levels, as the fat content of the meal associated with the administration of the…
- Trial name
- VITDAB_08606 (NCT00968734)
- Testing
- colecalciferol
- Where
- Brazil
- Volunteers
- 30 people
- Sponsor
- Federal University of Rio Grande do Sul
Vitamin D Deficiency
Effects of Vitamin D Fortification on Vitamin D Metabolite Profiles and Status in Vitamin D Insufficient Individuals
This is a cross-sectional study designed to compare plasma/serum and urine vitamin D metabolite profiles of vitamin D sufficient and insufficient individuals. There are two phases of this study.
- Trial name
- VITD-2013 (NCT02422784)
- Testing
- Rooibos Iced-Tea (Control), Rooibos Tea - Vitamin D3, Rooibos Tea- Vitamin D3 & Calcium
- Where
- Canada
- Volunteers
- healthy volunteers welcome
- Sponsor
- University of Manitoba
Burns, Bone Demineralization
Evaluation of Vitamin D Status in Children With Acute Burns
To see which vitamin D supplement (D2 vs D3) is most beneficial in burned children.
- Trial name
- VitaminD (NCT00536276)
- Testing
- Vitamin D2, Vitamin D3
- Where
- United States
- Volunteers
- 50 people
- Sponsor
- Shriners Hospitals for Children
Vitamin D Deficiency Defined as Serum 25OHD < 75 Nmol/l or 30ng/ml, Preeclampsia
Vitamin D and Preeclampsia
Hypothesis : Vitamin D serum concentration is decreased in the first trimester in pregnant women who will develop preeclampsia in the second or third trimester compare to a control group Primary purpose : To determine the vitamin…
- Conditions
- Vitamin D Deficiency Defined as Serum 25OHD < 75 Nmol/l or 30ng/ml, Preeclampsia, Neonatal Hypercalcemia, Pregnancy
- Trial name
- FEPED (NCT01648842)
- Where
- France
- Volunteers
- 3,173 people
- Sponsor
- Assistance Publique - Hôpitaux de Paris
Hyperglycemia, Postprandial, Vitamin D Status
Diabetes Risk in London and Its Association with Vitamin D by Ethnic Group (DELVE)
The goal of this study is to investigate the relationship between vitamin D status and a diabetes risk factor, postprandial glycaemic response in White, South Asian and Black African Caribbean populations in London.
- Trial name
- DELVE (NCT06241976)
- Testing
- Glucose drink, Pure orange juice
- Where
- United Kingdom
- Volunteers
- 111 people, healthy volunteers welcome
- Sponsor
- City, University of London
Vitamin D
Vitamin D, Bones, Nutritional and Cardiovascular Status
Vitamin D is not seen anymore only as a phosphocalcic hormone, but also as having an effect on global health (anti-infective, anti-inflammatory, anti-tumour roles and cardiovascular protection).
- Trial name
- VITADOS (NCT01832623)
- Testing
- Exploration of Vitamin D roles
- Where
- France
- Volunteers
- 100 people, healthy volunteers welcome
- Sponsor
- Hospices Civils de Lyon
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 Deficiency
Vitamin D of Chinese Children and Adolescents
The aim of this study was to assess the vitamin D status and analyze risk factors for vitamin D inadequacy of Chinese children and adolescents aged 6-17y.
- Trial name
- NCT03221972
- Where
- China
- Volunteers
- 15,000 people
- Sponsor
- Lichen Yang
Vitamin D Status
Vitamin D Supplementation and Immunity/Physical Performance
The purpose of this study is to examine the effect of vitamin D supplementation on vitamin D status, immunity and physical performance.
- Trial name
- NCT03132103
- Testing
- Oral Vitamin D3, Solar simulated radiation (SSR)
- Where
- United Kingdom
- Volunteers
- 260 people, healthy volunteers welcome
- Sponsor
- Bangor University
Overweight, Obesity
Vitamin D and Type 2 Diabetes Risk in UK Adults
This study is exploring the association between vitamin D and Type 2 diabetes risk in normal weight and overweight UK adults.
- Trial name
- NCT04339530
- Testing
- Normal weight and overweight adults
- Where
- United Kingdom
- Volunteers
- 300 people, healthy volunteers welcome
- Sponsor
- Liverpool Hope University
Early Childhood Caries, Vitamin D Deficiency
Vitamin D Status With Early Childhood Caries
Studies that give people vitamin D supplements to prevent caries have found that vitamin D is effective at preventing the development of caries.
- Trial name
- NCT03521492
- Testing
- serum vitamin D , calcium , parathyroid hormone and albumin level
- Where
- Saudi Arabia
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- Ministry of Health, Saudi Arabia
Vitamin D, Physical Function
Vitamin D and Physical Function in Older Adults
Projections from NHANES III indicate that approximately 12,000,000 U.S. adults ≥ 60 years of age have vitamin D insufficiency (serum 25(OH)D < 50 nmol/L).
- Trial name
- NCT00710957
- Volunteers
- 1,100 people, healthy volunteers welcome
- Sponsor
- Wake Forest University Health Sciences
Healthy
Fortified Cheese and Yogurt Products and Vitamin D Status in Young Children? Phase 2
This study is being done to test if adding vitamin D to cheese and yogurt products will help children further improve their vitamin D intake. All children will be given a six month supply of the milk products.
- Trial name
- D-KIDS (NCT02387892)
- Testing
- Cheese & yogurt + Vitamin D, Cheese & yogurt
- Where
- Canada
- Volunteers
- 51 people, healthy volunteers welcome
- Sponsor
- McGill University
Vitamin D Deficiency
Effect of Vitamin D-biofortified Eggs on Wintertime Serum 25-hydroxyvitamin D in Adults: Randomized Controlled Trial
While there have been a considerable number of studies on the impact of additional vitamin D in the diets of hens on the resulting egg vitamin D content, the effect of consumption of such vitamin D-enhanced eggs on vitamin D…
- Trial name
- EnhanceDeggs (NCT02678364)
- Testing
- Control eggs, Vitamin D3 eggs, 25-Hydroxyvitamin D3 eggs
- Where
- Ireland
- Volunteers
- 55 people, healthy volunteers welcome
- Sponsor
- University College Cork
Vitamin D Deficiency
Effects of Vitamin D3 Supplementation on Antioxidant Enzymes Status in Vitamin D3 Deficient Asthma COPD Overlap (ACO) Patients
Asthma-COPD overlap (ACO) is a new entity in the world of respiratory ailments. The respiratory tract of these patients are continuously exposed to oxidants (due to cigarette smoking) causing oxidative stress.
- Trial name
- NCT03931889
- Testing
- Vitamin D3
- Where
- Bangladesh
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh
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