Clinical trials: Vitamin D, open to volunteers
Hypovitaminosis D
The Effectiveness of a Weight-dependent Algorithm for Dosing Vitamin D.
Vitamin D is essential for calcium absorption and bone growth, brain development, and immune system function. Vitamin D is produced by the body in response to natural sunlight.
- Trial name
- NCT07876843
- Testing
- Vitamin D3, Calcium, and Vitamin C
- Where
- United States
- Volunteers
- 200 people, healthy volunteers welcome
- Sponsor
- Atlantic Health System
Vitamin D Deficiency
Vitamin D Status and Its Influencing Factors in Zhejiang Province: A Multicenter Cross-Sectional Study
Vitamin D deficiency is a global public health problem, with an estimated 1 billion people affected worldwide, and large-scale systematic data for Zhejiang Province remain scarce.
- Trial name
- NCT07866391
- Where
- 2 sites in China
- Volunteers
- 10,000 people, healthy volunteers welcome
- Sponsor
- First Affiliated Hospital of Zhejiang University
Vitamin D Deficiency
Bone Myoregulation Reflex and Postural Control in Vitamin D Deficiency
This observational study aims to investigate the relationship between vitamin D deficiency, postural stability, and neuromuscular control mechanisms in adults.
- Trial name
- BMR-VITD (NCT07435935)
- Where
- Turkey (Türkiye)
- Volunteers
- 24 people, healthy volunteers welcome
- Sponsor
- Istanbul Physical Medicine Rehabilitation Training and Research Hospital
Healthy, Suboptimal Vitamin C Levels
The Impact of Qualia Vitamin C+ on Individuals With Suboptimal and Adequate Vitamin C Levels
This is a double-blind, placebo-controlled, parallel-group, study evaluating the effect of a Qualia Vitamin C+ formulation on Whole Blood Vitamin C levels in the blood of healthy adults aged 25 years or older that have suboptimal…
- Conditions
- Healthy, Suboptimal Vitamin C Levels, Adequate Vitamin C Levels
- Trial name
- NCT07652346
- Testing
- Qualia Vitamin C+
- Where
- United States
- Volunteers
- 152 people, healthy volunteers welcome
- Sponsor
- Qualia Life Sciences
Healthy Adult Participants, Vitamin D Insufficiency
Supplementation of Cholecalciferol and Related Active Metabolites Through Bioenhancing Layer's Eggs
The purpose of this research is to evaluate if 1) consumption of vitamin D3- or 25(OH)D3-biofortified eggs will increase vitamin D and 25(OH)D status in young adults who consume these bioenhanced eggs, 2) to determine if the gut…
- Trial name
- SCRAMBLE (NCT07859280)
- Testing
- Vitamin D3 bioenhanced eggs, 25(OH)D3 bioenhanced eggs
- Where
- United States
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- Cornell University
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
Vitamin D
Comparing Vitamin D Results and Acceptability of Sampling Obtained From Dried Blood Spot, Tasso+ Capillary Sampling, and Venous Blood.
This study will evaluate the performance and acceptability of different sampling methods for measuring vitamin D, specifically 25-hydroxyvitamin D₂ and 25-hydroxyvitamin D₃.
- Trial name
- VitD TASSO (NCT07782528)
- Testing
- Vit D Tasso+
- Volunteers
- 35 people, healthy volunteers welcome
- Sponsor
- The Royal Wolverhampton Hospitals NHS Trust
Vitamin D Insufficiency
25(OH)-Vitamin D and Its Association With Structural and Functional Parameters in Hospitalized Patients With Neurological Diseases
The NeuroVitD study aims to assess vitamin D levels in hospitalized cohorts with neurological disorders resulting in motor disabilities, providing epidemiological data necessary for guidelines.
- Trial name
- NeuroVitD (NCT06791044)
- Testing
- DELTIUS
- Where
- 2 sites in Greece
- Volunteers
- 120 people, healthy volunteers welcome
- Sponsor
- Dionyssiotis, Yannis, M.D.
Dental Implant, Dental Implant Failed
Effect of Systemic Vitamin D on Dental Implant Osseointegration
The primary goal for any oral implantologist is to obtain satisfactory healing and long-term treatment success. Osseointegration is the key to dental implant success8 and is required to achieve direct structural and functional…
- Conditions
- Dental Implant, Dental Implant Failed, Vitamin D Deficiency
- Trial name
- VIDOS (NCT07684404)
- Testing
- Vit D
- Where
- Egypt
- Volunteers
- 10 people, healthy volunteers welcome
- Sponsor
- Future University in Egypt
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
Periodontal Diseases, Gingivitis
The Effect of Vitamin D Supplementation on the Anti-inflammatory Response in Periodontal Diseases
A review of the literature revealed that while there are studies investigating the relationship between vitamin D and periodontal disease, there are no studies investigating the anti-inflammatory effect of vitamin D on…
- Conditions
- Periodontal Diseases, Gingivitis, Vitamin D Deficiency
- Trial name
- NCT07636733
- Testing
- Non-surgical periodontal treatment, Vitamin D administration, Oral Hygiene Education and Patient Motivation
- Where
- Turkey (Türkiye)
- Volunteers
- 120 people, healthy volunteers welcome
- Sponsor
- Recep Tayyip Erdogan University Training and Research Hospital
Obesity & Overweight, Vitamin D
Exercise Training and Vitamin D Metabolism
The prevalence of Vitamin D deficiency is significantly higher in adults with overweight/obesity compared to those with normal body mass index (BMI).
- Trial name
- Hybri-D (NCT07300332)
- Testing
- Exercise training, Control
- Where
- Greece
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- University of Thessaly
Gingival Pigmentation, Depigmentation
Gingival Hyperpigmentation Treatment
It is a clinical study conducted to evaluate the effect of vitamin C and Glucathonine injection of pigmented gingival tissue versus surgical removal by scalpel
- Conditions
- Gingival Pigmentation, Depigmentation, Vitamin C, Glutathione
- Trial name
- NCT07595705
- Testing
- Vitamin c and glutathione, Surgical depigmentation
- Where
- Egypt
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- Cairo University
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, 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
- NCT07100795
- Testing
- No Interventions
- Where
- Bosnia and Herzegovina
- Volunteers
- 360 people, healthy volunteers welcome
- Sponsor
- University of Mostar
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
Postnatal Women, Vitamin D
Pilates vs Aerobic Exercises on Vitamin D and Ionized Calcium in Postnatal
Vitamin D and calcium levels are negatively affected during postpartum period, making postnatal woman more vulnerable to health issues and consequently lowering her quality of life.
- Trial name
- NCT07566715
- Testing
- Exercise
- Where
- 2 sites in Egypt
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- Adly A Adam
Vitamin D Deficiency, Vitamin D Insufficiency
ALPCO 25(OH) Vitamin D CLIA Kit - Fresh Versus Frozen Serum and Plasma Stability Study
This study evaluates the stability of 25-hydroxyvitamin D [25(OH)D] measurements in human serum and plasma using the ALPCO 25(OH) Vitamin D CLIA Kit.
- Conditions
- Vitamin D Deficiency, Vitamin D Insufficiency, Healthy Volunteers
- Trial name
- NCT07565064
- Testing
- ALPCO 25(OH) Vitamin D CLIA Kit
- Where
- United States
- Volunteers
- 80 people, healthy volunteers welcome
- Sponsor
- American Laboratory Products Company
Overactive Bladder, Vitamin D Deficiency
The Role of Urinary RhoA, NGF, and BDNF Levels in Overactive Bladder and Vitamin D Deficiency
The primary aim of this study is to evaluate the role of three specific urinary proteins-RhoA, Nerve Growth Factor (NGF), and Brain-Derived Neurotrophic Factor (BDNF)-as potential biomarkers for the diagnosis and follow-up of…
- Trial name
- NCT07513363
- Testing
- Urotherapy
- Where
- Turkey (Türkiye)
- Volunteers
- 52 people, healthy volunteers welcome
- Sponsor
- Tarik Emre Sener
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