Clinical trials: Vitamin D Status
Infant Vitamin K Status, Vitamin K Deficiency Bleeding
The OK Daily Study
The OK Daily Study is a multi-centred, part-randomised, part blinded, four cohort study. We are exploring daily dietary supplementation with vitamin K2, specifically menaquinone-7 (MK-7), given to breastfed infants or…
- Trial name
- NCT07620236
- Testing
- Combined MK-7 + vitamin D3 drops, Vitamin D3 Drops, MK-7 capsules
- Volunteers
- 134 people, healthy volunteers welcome
- Sponsor
- Norfolk and Norwich University Hospitals NHS Foundation Trust
Biomarkers of B-vitamin Status and Gut Microbiome Composition
Effect of a Food Intervention With a Prebiotic Alone or Combined With B-vitamins on Gut Microbiota Diversity, Inflammation and Mental Health Outcomes in Older Adults (GutFood)
Ageing is associated with changes in gut microbiota composition, increased inflammation, and a greater risk of poor mental health outcomes.
- Trial name
- NCT07592975
- Testing
- Inulin and B-vitamins, Inulin
- Where
- United Kingdom
- Volunteers
- 84 people, healthy volunteers welcome
- Sponsor
- University of Ulster
Vitamin D Biofortification, Vitamin D Fortification
Vitamin D (Bio)Fortified Shopping Baskets to Improve Vitamin D Status
Vitamin D is essential for healthy bones, muscles, and immune function. It comes from food, supplements, and sunlight. There are two main forms; vitamin D2, found mainly in plant foods, and vitamin D3, which comes from animal…
- Conditions
- Vitamin D Biofortification, Vitamin D Fortification, Vitamin D Status
- Trial name
- NCT07349290
- Testing
- Vitamin D (bio)fortified food basket, Control food basket
- Where
- United Kingdom
- Volunteers
- 160 people, healthy volunteers welcome
- Sponsor
- University of Ulster
Body Weight, Obesity & Overweight
Breastmilk and the Link to Overweight/Obesity and Maternal Diet in the Mother-breastmilk-child Triad
The prospective 5-month follow-up study will involve 150 mother-infant dyads grouped based on maternal baseline BMI category (normal weight, overweight, obesity).
- Conditions
- Body Weight, Obesity & Overweight, Human Milk/Breastfeeding, Body Composition
- Trial name
- BLOOM-Triad (NCT07457515)
- Where
- 4 sites in Canada, Poland
- Volunteers
- 165 people, healthy volunteers welcome
- Sponsor
- Warsaw University of Life Sciences
Vitamin D Status
Hypovitaminosis D Prediction Score
Vitamin D has effects on many tissues, and hypovitaminosis D is frequent. In a French survey conducted among 1587 adults, vitamin D insufficiency (<30ng/ml) has been reported in 80% of subjects, including 43% with moderate…
- Trial name
- SCOPYD (NCT02822651)
- Testing
- Blood sampling, self-administered questionnaire
- Where
- France
- Volunteers
- 2,592 people, healthy volunteers welcome
- Sponsor
- Hospices Civils de Lyon
Endometriosis, Vitamin D Deficiency/Insufficiency
Analysis of Vitamin D and VDR Expression in Endometriosis: A Case-Control Study
The goal of this cross-sectional prospective matching study is to evaluate whether serum vitamin D levels and vitamin D receptor (VDR) expression are associated with the presence and severity of endometriosis in women of…
- Conditions
- Endometriosis, Vitamin D Deficiency/Insufficiency, Vitamin D Status
- Trial name
- NCT06289257
- Testing
- Vitamin D level, Vitamin D receptor
- Where
- Thailand
- Volunteers
- 108 people, healthy volunteers welcome
- Sponsor
- Khon Kaen University
Nutritional Status, Nutrient Deficiency
Challenges in Achieving Adequate Dietary Status of Women
The aim of the study is to investigate the dietary habits of women of reproductive age (20-49 years). We aim to obtain epidemiological data on the intake and adequacy of key macronutrients and micronutrients, as well as to…
- Conditions
- Nutritional Status, Nutrient Deficiency, Micronutrient Deficiency, Vitamin D Deficiency
- Trial name
- NutriFem (NCT06745817)
- Testing
- Assessement of nutritional status, Dermis density and thickness, Skin elasticity
- Where
- 3 sites in Slovenia
- Volunteers
- 300 people, healthy volunteers welcome
- Sponsor
- Institute of Nutrition, Slovenia (Nutris)
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 K Status
Vitamin K Supplementation Study in Healthy Volunteers (Aim 2B)
The overall purpose of this study is to determine how variation in the CYP4F2 gene modulates the synthesis of vitamin K-dependent clotting factors.
- Trial name
- NCT04450212
- Testing
- Phase I, Buccal Swab Collection for DNA Isolation, Phase II, Vitamin K (Vitacost) Supplementation
- Where
- United States
- Volunteers
- 106 people, healthy volunteers welcome
- Sponsor
- University of Washington
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
Vitamin D Status, Glucose Tolerance
Vitamin D Retrospective Study and Role With Disease
Vitamin D deficiency is associated with a heightened risk for developing type 2 diabetes, hypertension, and osteopenia/osteoporosis.
- Conditions
- Vitamin D Status, Glucose Tolerance, Blood Pressure, Bone Mineral Density
- Trial name
- NCT01798030
- Testing
- Vitamin D
- Where
- United States
- Volunteers
- 362 people, healthy volunteers welcome
- Sponsor
- Baltimore VA Medical Center
Nutritional Status, Nutrient Deficiency
Adults Nutrition as a Protective or Health-risk Factor
To obtain up-to-date data on nutrient intakes in adults, a national dietary survey - the EU Menu study will be conducted during 12 consecutive months in 2017/2018, providing data on the consumption of foods and enabling the…
- Conditions
- Nutritional Status, Nutrient Deficiency, Micronutrient Deficiency, Vitamin D Deficiency
- Trial name
- NUTRIHEALTH (NCT03284840)
- Testing
- Assessement of nutritional status, Thyroid size
- Where
- 3 sites in Slovenia
- Volunteers
- 280 people, healthy volunteers welcome
- Sponsor
- Institute of Nutrition, Slovenia (Nutris)
Vitamin D Status, Osteoporosis
Vitamin D Status and Bone Health of Older Adults in Care Facilities
Vitamin D deficiency is proposed to be prevalent in community-dwelling older adults, with prevalence substantially higher among older adults in residential care facilities.
- Conditions
- Vitamin D Status, Osteoporosis, Sarcopenia
- Trial name
- NCT04399291
- Where
- United Kingdom
- Volunteers
- 200 people, healthy volunteers welcome
- Sponsor
- University of Ulster
Maternal Vitamin D Status
Vitamin D Supplementation and Pregnancy Outcomes
Groups (group 1 receives 1000 IU vitamin D and group 2 receives 2000 IU vitamin D) through a random allocation. It is necessary to mention that all cases in each group could be able to receive the current supplementation during…
- Trial name
- NCT03308487
- Testing
- vitamin D3 (1000 IU), Vitamin D3 (2000 IU)
- Where
- Iran
- Volunteers
- 84 people, healthy volunteers welcome
- Sponsor
- Tirang R. Neyestani, Ph.D.
Vitamin K-status
Dose-finding Study for Vitamin K2 in Human Volunteers
Earlier studies have shown that high vitamin K-intake leads to improved bone and vascular health by increased carboxylation of Gla-proteins in these tissues.
- Trial name
- NCT00483431
- Testing
- MK7
- Where
- Netherlands
- Volunteers
- 42 people, healthy volunteers welcome
- Sponsor
- Maastricht University Medical Center
Vitamin D Status
Vitamin D Intervention in Infants
The study is a randomized, controlled, double blinded study evaluating the effect of recommended (400 IU) and 1 200 IU daily vitamin D substitution, given from 2 weeks to 2 years of age, on growth, bone development, neurologic…
- Trial name
- VIDI (NCT01723852)
- Testing
- Vitamin D at 30 ug/day, Vitamin D at 10 ug/day
- Where
- Finland
- Volunteers
- 1,000 people, healthy volunteers welcome
- Sponsor
- Helsinki University Central Hospital
Vitamin A Status
Estimation of Vitamin A Stores in Children and Women in Guatemala and Relation With Potential Toxicity Markers
The goal of this study is to assess whether 3-5 years-old children who have Vitamin A intakes above the tolerable upper intake level (UL=900 ug per day) have higher total body Vitamin A stores and biomarkers of excessive vitamin…
- Trial name
- GloVitAS-GU (NCT03345147)
- Testing
- High Vitamin A intake, Normal Vitamin A intake
- Where
- 3 sites in Guatemala
- Volunteers
- 178 people, healthy volunteers welcome
- Sponsor
- Institute of Nutrition of Central America and Panama
Vitamin A Status
Efficacy of Vitamin A Fortified Rice in Lactating Thai Women
Vitamin A deficiency (VAD) remains a public health problem that occurs in children and women. WHO estimates that 190 million preschool age children (under five years of age) and 19.1 million pregnant women have inadequate…
- Trial name
- EVAL (NCT03056625)
- Testing
- Vitamin A fortified rice, Normal rice
- Where
- Thailand
- Volunteers
- 70 people, healthy volunteers welcome
- Sponsor
- Prince of Songkla University
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
Vitamin D Status
Effect of Different Vitamin D Vitamers on Vitamin D Status
Background: Dietary intake of vitamin D includes vitamin D3 (VitD3), 25-hydroxyvitamin D3 (25OHD3) and vitamin D2 (VitD2). However, the bioactivity of the different species is currently not scientifically established.
- Trial name
- VitD (NCT02860663)
- Testing
- Vitamin D3, Vitamin D2, 25OHD
- Where
- Denmark
- Volunteers
- 14 people, healthy volunteers welcome
- Sponsor
- University of Copenhagen