Clinical trials: Vitamin D Deficiency, 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
Vision Loss Night, Vision Disorders
OPI-NXYDLD-303 Safety and Efficacy of Phentolamine Ophthalmic Solution in Keratorefractive Surgery Participants With Decreased Mesopic Visual Acuity
The goal of this clinical trial is to learn if Phentolamine Ophthalmic Solution works to treat adults that have had keratorefractive surgery and have decreased visual acuity under mesopic conditions.
- Trial name
- LYNX-3 (NCT07140783)
- Testing
- 0.75% Phentolamine Ophthalmic Solution
- Where
- 20 sites in United States
- Volunteers
- 580 people
- Sponsor
- Opus Genetics, Inc
Vitamin D 25-Hydroxylase Deficiency, Undernutrition
Impact of Trout Fish, Cow Milk With Egg, Vitamin D Supplementation, and Dietary Education on Vitamin D Status, Undernutrition, and Neurocognitive Outcomes Among School Children in Pakistan: An Open-label Individually Randomized Controlled Trial
Vitamin D deficiency and undernutrition are major public health concerns globally, particularly among children in low-resource and high-altitude settings.
- Conditions
- Vitamin D 25-Hydroxylase Deficiency, Undernutrition, Neurocognitive Development
- Trial name
- NCT07864662
- Testing
- Vitamin D supplement 4000 IU weekly, 200 grams of cooked trout fish, 250 milliliters of whole cow milk + whole egg
- Where
- Pakistan
- Volunteers
- 304 people
- Sponsor
- Aga Khan University
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
Deficiency, Vitamin C, Chronic Disease
A Long-term Observational Study to Describe the Use of Vitamin-C Injektopas® 7.5 g in Patients With Vitamin C Deficiency
The goal of this observational study is to learn more about the disease and the symptoms where the product will use and in which patient groups. Further on, it is interesting to know clinical pictures, the symptoms improve.
- Conditions
- Deficiency, Vitamin C, Chronic Disease, Acute Disease
- Trial name
- NCT06983847
- Where
- Austria
- Volunteers
- 1,000 people
- Sponsor
- Pascoe Pharmazeutische Praeparate GmbH
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
Triple Negative Breast Cancer, Vitamin D Deficiency
Impact of Vitamin D Supplementation on the Rate of Pathologic Complete Response in Vitamin D Deficient Patients
A two arm pilot study investigating the rate of pathologic complete response in patients with vitamin D deficiency and triple negative breast cancer undergoing standard neoadjuvant chemotherapy + vitamin D supplementation…
- Conditions
- Triple Negative Breast Cancer, Vitamin D Deficiency, Invasive Breast Cancer
- Trial name
- NCT04677816
- Testing
- Standard of Care Neoadjuvant Chemotherapy (NAC), Vitamin D3, Drug Diary
- Where
- United States
- Volunteers
- 50 people
- Sponsor
- Wake Forest University Health Sciences
Graft Vs Host Disease, Vitamin A Deficiency
Vitamin A Supplementation in Allogeneic Stem Cell Transplantation.
The investigators hypothesize that single oral high dose supplementation with vitamin A will reduce the incidence of moderate-severe chronic graft-versus-host disease (GVHD) compared with placebo.
- Conditions
- Graft Vs Host Disease, Vitamin A Deficiency, Vitamin D Deficiency
- Trial name
- NCT06450925
- Testing
- Vitamin A
- Where
- 3 sites in United States
- Volunteers
- 190 people
- Sponsor
- Children's Hospital Medical Center, Cincinnati
Polycystic Ovarian Syndrome in Adolescent Females, Vitamin D Deficiency
Evaluation of the Clinical and Psychological Impact of Vitamin D Replacement in Adolescent Females at Risk for Polycystic Ovarian Syndrome (PCOS)
This study is a double blind, placebo controlled, randomized trial of study subjects with PCOS and low vitamin D to 2 groups- placebo and vitamin D replacement.
- Trial name
- NCT04355572
- Testing
- Vitamin D 4000IU daily
- Where
- United States
- Volunteers
- 60 people
- Sponsor
- Yale University
Locally Advanced Cervical Cancer, Vitamin D Concentration
Vitamin D Status and Clinical Outcomes in Locally Advanced Cervical Cancer
Background. Definitive chemoradiotherapy represents the standard therapeutic approach for the management of locally advanced cervical cancer.
- Trial name
- CERVITAL (NCT07743918)
- Testing
- Pretreatment Vitamin D Assessment in Serum and Cervical Lavage Fluid
- Where
- Serbia
- Volunteers
- 100 people
- Sponsor
- University of Kragujevac
Cholestatic Liver Disease, Chronic Liver Disease (CLD)
Vitamin D2 vs Vitamin D2 Plus Calcitriol in Cholestatic Children With Vitamin D Deficiency
The goal of this clinical trial is to learn whether adding calcitriol to vitamin D2 can improve vitamin D deficiency in children with cholestasis and chronic liver disease.
- Conditions
- Cholestatic Liver Disease, Chronic Liver Disease (CLD), Vitamin D Deficiency, Children
- Trial name
- VITD-CHOL (NCT07670611)
- Testing
- Vitamin D2, Calcitriol
- Where
- Thailand
- Volunteers
- 54 people
- Sponsor
- Chulalongkorn University
Premature, Preterm Infant Health
Vitamin A Supplementation and Breast Milk Vitamin A Levels in Mothers of Preterm Infants
Preterm infants are at increased risk of vitamin A deficiency because they are born with low vitamin A stores and depend largely on breast milk to meet their nutritional needs.
- Conditions
- Premature, Preterm Infant Health, Vitamin A Deficiency, Human Milk
- Trial name
- VITAL (NCT07736768)
- Testing
- Oral multivitamin containing vitamin A
- Where
- United States
- Volunteers
- 20 people
- Sponsor
- University of Mississippi Medical Center
Bronchial Asthma, Vitamin D Deficiency
Vitamin D Status and Asthma Control, Pulmonary Function, and Oxidative Stress in Adults With Bronchial Asthma
Asthma is a chronic inflammatory airway disease associated with variable airflow limitation and persistent respiratory symptoms.
- Conditions
- Bronchial Asthma, Vitamin D Deficiency, Pulmonary Function Impairment, Oxidative Stress
- Trial name
- VD-ASTHMA (NCT07733635)
- Volunteers
- 134 people
- Sponsor
- Sinai University
Type 2 Diabetes Mellitus, Obesity
Vitamin D Status and Lipid Profile in Obese Adults With Type 2 Diabetes
This prospective, single-center, cross-sectional observational study aims to evaluate the association between serum 25-hydroxyvitamin D concentrations and lipid profile parameters among adults with obesity and established type 2…
- Conditions
- Type 2 Diabetes Mellitus, Obesity, Dyslipidemia, Vitamin D Deficiency
- Trial name
- VILD-T2D (NCT07729553)
- Volunteers
- 150 people
- Sponsor
- Sinai University
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
Retinal Disease, Age-Related Macular Degeneration
Stem Cell Ophthalmology Treatment Study II
This study will evaluate the use of autologous bone marrow derived stem cells (BMSC) for the treatment of retinal and optic nerve damage or disease.
- Conditions
- Retinal Disease, Age-Related Macular Degeneration, Retinitis Pigmentosa, Stargardt Disease
- Trial name
- SCOTS2 (NCT03011541)
- Testing
- Arm 1
- Where
- 4 sites in United States, Austria and 1 more
- Volunteers
- 500 people
- Sponsor
- MD Stem Cells
Osteoporosis, Vitamin C Deficiency
Link Between ASCorbemia Level and Osteoporosis
This monocentric observational study aims to evaluate the association between plasma vitamin C levels (ascorbemia) and the presence of osteoporotic vertebral fractures in patients with osteoporosis.
- Conditions
- Osteoporosis, Vitamin C Deficiency, Vertebral Fractures
- Trial name
- ASCO (NCT07660484)
- Testing
- Plasma vitamin C assessment
- Where
- France
- Volunteers
- 40 people
- Sponsor
- Centre Hospitalier Universitaire de Nice
Benign Paroxysmal Positional Vertigo (BPPV)
Association Between Benign Paroxysmal Positional Vertigo and Vitamin D Deficiency .
Association between Benign Paroxysmal Positional Vertigo and Vitamin D deficiency
- Trial name
- NCT07491965
- Testing
- Vitamin D
- Where
- Egypt
- Volunteers
- 160 people
- Sponsor
- Sohag University
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