Clinical trials: Vitamin A Deficiency
Preeclampsia, Vitamin A Deficiency
The Correlation Between Vitamin A / E Levels and Preeclampsia
Vitamin A (VA) and vitamin E (VE) are fat-soluble vitamins and indispensable substances in life activities. VA plays an important role in visual function, normal formation and development of epithelial cells, development and…
- Conditions
- Preeclampsia, Vitamin A Deficiency, Vitamin E Deficiency
- Trial name
- NCT03971604
- Testing
- Vitamin A, Vitamin E
- Where
- China
- Volunteers
- 300 people, healthy volunteers welcome
- Sponsor
- Second Affiliated Hospital, Zhejiang University, School of Medicine
B12 Deficiency Vitamin, Energy Supply; Deficiency
An Exploratory Investigation of a B12 Vitamin to Increase Energy and Focus
This study aims to examine the effects of Sourse's Hype Bites at being able to increase vitamin B12 levels to promote positive health outcomes. Participants will consume Hype Bites daily.
- Conditions
- B12 Deficiency Vitamin, Energy Supply; Deficiency, Mood
- Trial name
- NCT05517005
- Testing
- Hype Bites Supplement
- Where
- United States
- Volunteers
- 38 people, healthy volunteers welcome
- Sponsor
- Sourse
Vitamin Deficiency
Effectiveness of a Nutraceutical in Raising Circulating Serum Vitamin, Mineral and Amino Acid Levels in Patients.
The purpose of this study is to correlate the findings of an early study with current data.
- Trial name
- NCT04054505
- Testing
- EZPAK
- Where
- United States
- Volunteers
- 275 people, healthy volunteers welcome
- Sponsor
- Optimal Health Research
Vitamin D Deficiency
The Effect of Fat on Vitamin D Absorption
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
- VITD_100484 (NCT01519986)
- Testing
- Vitamin D3
- Volunteers
- 64 people, healthy volunteers welcome
- Sponsor
- Federal University of Rio Grande do Sul
Deficiency of Vitamin D3
Study on the Effects of a Recommendation Based Supply of Vitamin D3 in Healthy Volunteers
The aim of this study is to investigate whether a supplementation of 20 µg Vitamin D3 per day for 12 weeks can be used to normalize vitamin d-Status
- Trial name
- NCT01711905
- Testing
- Vitamin D3
- Where
- Germany
- Volunteers
- 107 people, healthy volunteers welcome
- Sponsor
- Martin-Luther-Universität Halle-Wittenberg
Vitamin D Deficiency
Effects of Vitamin D Supplementation During Pregnancy on Clinical Outcomes and Immune Function
Researchers at the USDA Western Human Nutrition Research Center and clinicians at UC Davis Medical Center are currently conducting a study on the effects of vitamin D supplementation during pregnancy on maternal health and immune…
- Trial name
- NCT01417351
- Testing
- 400 IU vitamin D3, 2,000 IU Vitamin D3
- Where
- 2 sites in United States
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- USDA, Western Human Nutrition Research Center
Iron Deficiency, Anemia
The Efficacy of a Local Vitamin-C Rich Fruit (Guava) in Improving Iron Absorption From Mungbean Based Meals and Its Effect on Iron Status of Rural Indian Children (6-10 Years)
Iron deficiency is estimated to affect about one fifth of the world's population, and women and children are among the most severely affected.
- Trial name
- MUGUST_2 (NCT01191463)
- Testing
- Mung Bean Meal, Guava
- Where
- India
- Volunteers
- 300 people, healthy volunteers welcome
- Sponsor
- Wageningen University
Visual Snow Syndrome, Migraine
Investigating Brain Function in People With and Without Visual Snow Syndrome Using Adaptation to Visual Stimuli
The goal of this study is to learn more about the brain pathways and activity involved in creating Visual Snow Syndrome (VSS). The main questions it aims to answer are: Does VSS arise from spontaneous activity in brain pathways?…
- Conditions
- Visual Snow Syndrome, Migraine, Healthy
- Trial name
- VPVSS (NCT06961864)
- Testing
- Visual Adaptation, Assessments and Questionnaires, Functional Magnetic Resonance Imaging (fMRI)
- Where
- United States
- Volunteers
- 100 people, healthy volunteers welcome
- Sponsor
- University of Minnesota
Vitamin D Deficiency, Sarcopenia
Vitamin D Deficiency and Body Composition in the Patients With Hemophilia
Hemophilia is associated with osteoporosis and increased prevalence of low bone mineral density (BMD). Many clinical risk factors have been reported, such as hemophilic arthropathy, reduced physical activity, decreased sun…
- Conditions
- Vitamin D Deficiency, Sarcopenia, Osteoporosis, Body Composition
- Trial name
- NCT05517070
- Where
- Taiwan
- Volunteers
- 80 people, healthy volunteers welcome
- Sponsor
- Tsung-Ying Li
Leg Cramps, Nocturnal
Vitamin D for Painful Nocturnal Leg Cramps
1. Research question: Does vitamin D reduce the frequency and severity of nocturnal leg cramps in older persons who previously took quinine for leg cramps? 2.
- Trial name
- NCT00715429
- Testing
- vitamin d
- Where
- United States
- Volunteers
- 29 people, healthy volunteers welcome
- Sponsor
- University of Wisconsin, Madison
Vitamin D Deficiency
The Effect of a Meal on Vitamin D Absorption
This study seeks to determine if vitamin D3 absorption in healthy adults will be enhanced in the presence of a meal and if the enhancement will be greater when the meal is low as opposed to high in fat content.
- Trial name
- NCT01268176
- Testing
- cholecalciferol
- Where
- United States
- Volunteers
- 62 people, healthy volunteers welcome
- Sponsor
- Tufts University
Vitamin D Deficiency, Hypovitaminosis A
A Randomized Controlled Trial Testing The Effect Of A Multi-Nutrient Fortified Juice
The goal of this investigator-initiated study is to determine whether the fortification of orange juice with vitamin D, vitamin A, and vitamin E will enhance the vitamin D, vitamin A, and vitamin E status children ages 6-10 that…
- Conditions
- Vitamin D Deficiency, Hypovitaminosis A, Vitamin E Deficiency
- Trial name
- NCT01909063
- Testing
- Vitamin D, Vitamin D, Vitamin E, and Vitamin A, Control, 700 mg Calcium
- Where
- United States
- Volunteers
- 180 people, healthy volunteers welcome
- Sponsor
- Boston University
PCOS
Correction of Vitamin D Deficiency and Its Effect on Ovulation Induction in Women With PCOS (VIDEO): A Feasibility RCT
Recently, a special emphasis has recently been directed to the potential role of vitamin D and some regulatory peptides (e.g. adipokines and follistatin) and their associated metabolic roles and genetic factors in the development…
- Trial name
- PCOSD (NCT02656121)
- Testing
- Vitamin D, Ovulatory Agent
- Where
- Egypt
- Volunteers
- 300 people, healthy volunteers welcome
- Sponsor
- Ain Shams University
Osteoarthritis, Osteoporosis
Development of a Non-invasive Assessment of Human Bone Quality Using Spatially Offset Raman Spectroscopy
In this study spatially offset Raman spectroscopy (SORS), which allows the collection of Raman spectra through turbid media, is being applied to collect Raman spectra of bone.
- Conditions
- Osteoarthritis, Osteoporosis, Osteogenesis Imperfecta, Rickets / Osteomalacia
- Trial name
- NCT02814591
- Testing
- spatially offset Raman spectrometer (SORS)
- Volunteers
- 245 people, healthy volunteers welcome
- Sponsor
- University College, London
Deficiency, Vitamin D, Elderly, Frail
The Effect of Calcifediol (Hy.D 25 SD/S) and Vitamin D3 on Muscle Strength in a Frail Elderly Population
In an ageing population, the need for interventions to help older people remain healthy, active and independent for as long as possible, increases.
- Trial name
- D-Fit (NCT02349282)
- Testing
- Calcifediol 10ug/day, Vitamin D3 20ug/day
- Where
- Netherlands
- Volunteers
- 78 people, healthy volunteers welcome
- Sponsor
- Wageningen University
Iron Deficiency, Folic Acid Deficiency
Relative Bioavailability of Iron and Folic Acid in New Test Supplement
Deficiencies of iron and folic acid during pregnancy can lead to adverse outcomes for the fetus, thus supplements are recommended. Adherence to current tablet-based supplements is documented to be poor.
- Trial name
- NCT00789490
- Testing
- Daminaide 995 - SuppleFem Sprinkles, Materna
- Where
- Canada
- Volunteers
- 18 people, healthy volunteers welcome
- Sponsor
- University of Toronto
Vitamin D Deficiency
The Effects of Vitamin D3 Alone and in a Combination With Omega-3 on the Association of C-peptide With Glycemic Control
The Effects of Vitamin D3 alone and in a combination with omega-3 on the association of C-peptide with glycemic control
- Trial name
- NCT04307784
- Testing
- VD3, Omega-3FA, VD3 and Omega-3FA
- Where
- Jordan
- Volunteers
- 115 people, healthy volunteers welcome
- Sponsor
- Applied Science Private University
Vitamin D Deficiency
Effects of Vitamin D Dose and Genotype of the Binding Protein in Infants and Children
The purpose of this study is to determine if the vitamin D binding protein genotype influences circulating vitamin D levels and if it may have functional consequences on vitamin D activity.
- Trial name
- VitaD (NCT01050387)
- Testing
- Vitamin D
- Where
- United States
- Volunteers
- 193 people, healthy volunteers welcome
- Sponsor
- Yale University
Vitamin D Deficiency
The 'Hidden' Biological Impact of Vitamin D Deficiency: a Biomarker Study; Part 2
The investigators major aims are to: determine the vitamin D status of a group of young, apparently healthy adults in Hong Kong; examine inter-relationships between vitamin D status and biomarkers of DNA damage and repair…
- Trial name
- NCT02451787
- Testing
- Vitamin D
- Where
- Hong Kong
- Volunteers
- 27 people, healthy volunteers welcome
- Sponsor
- The Hong Kong Polytechnic University
Vitamin D Deficiency
Effect of Vitamin d and Omega 3 on Osteocalcin
Assessing the combined effect of omega-3 fatty acid and vitamin D 3 on plasma osteocalcin levels
- Trial name
- NCT04005612
- Testing
- vitamin D3, omega-3 fatty acid, vitamin D3 and omega-3 fatty acid
- Where
- Jordan
- Volunteers
- 120 people, healthy volunteers welcome
- Sponsor
- Applied Science Private University