Clinical trials: Deficiency Vitamins
Vitamin A Deficiency, Low Serum Retinol
Efficacy of β-carotene Biofortified Maize in Reducing Vitamin A Deficiency Among Children
The purpose of this cluster-randomized trial is to examine whether daily consumption of β-carotene biofortified maize flour can reduce the prevalence of vitamin A deficiency and improve the vitamin A status and among 4-8 year old…
- Trial name
- NCT01695148
- Testing
- β-Carotene Biofortified Maize Flour, White Maize Flour
- Where
- Zambia
- Volunteers
- 1,228 people, healthy volunteers welcome
- Sponsor
- Johns Hopkins Bloomberg School of Public Health
Healthy, Vitamin D Deficiency
Can Correction of Low Vitamin D Status in Infancy Program for a Leaner Body Composition?
One in four infants are born with low amounts of vitamin D stored in their body. This study is designed to test whether improving vitamin D status quickly after birth helps infants to build muscle and to normalize growth.
- Conditions
- Healthy, Vitamin D Deficiency, Gestational Diabetes
- Trial name
- NCT02563015
- Testing
- cholecalciferol, Reference 400
- Where
- Canada
- Volunteers
- 139 people, healthy volunteers welcome
- Sponsor
- McGill University
Deficiency, Vitamin C
Hypovitaminosis C Prevalence and Risk Factors in an Acute Geriatric Unit
Vitamin C is essential for numerous biological processes as it acts as a cofactor in various hydroxylation reactions, but also as a powerful antioxidant.
- Trial name
- HYPO-VIT-C (NCT05668663)
- Testing
- Plasmatic Vitamin C concentrations (known as ascorbemia) on a single blood sample
- Where
- France
- Volunteers
- 434 people, healthy volunteers welcome
- Sponsor
- Hospices Civils de Lyon
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
Nutritional Deficiency
The Use of the 25 (OH) D Saliva Test as a Substitute for the 25 (OH) D Serum Test in Healthy People
Routine examination of vitamin D levels is carried out by checking serum 25 (OH)D levels, which indicate circulating vitamin D levels.
- Trial name
- NCT04655664
- Testing
- not currently consumed vitamin D supplements regularly, consumed vitamin D supplements regularly
- Where
- Indonesia
- Volunteers
- 56 people, healthy volunteers welcome
- Sponsor
- Universitas Sumatera Utara
Neural Tube Defects, Folic Acid Deficiency
Feasibility, Acceptability and Directional Signal Effect on Blood Folate Levels of Iodized Salt Fortified With Folic Acid: Clinical Study
Aim 1: Assess directional signal of effect of fortified salt with folic acid and iodine on blood serum folate levels. It will be accomplished by feasibility pre-test/post-test clinical study by estimating mean and variability of…
- Conditions
- Neural Tube Defects, Folic Acid Deficiency, Fortification
- Trial name
- FASALT (NCT05935631)
- Testing
- Salt with folic acid and iodine
- Where
- United States
- Volunteers
- 32 people, healthy volunteers welcome
- Sponsor
- University of Alabama at Birmingham
Deficiency, Vitamin D
Effect of Vitamin D Replacement on Bone Healing in Mini-dental Implants
1. Title 2. Executive team 3. Research line 4. Summary 5. Research problem 6. Justification 7. Literature review 8. Objectives 9. Materials and methods 10. Dissemination of knowledge generated 11. Schedule of activities 12.
- Trial name
- NCT03356730
- Testing
- Vitamin D
- Where
- Brazil
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- Universidade de Passo Fundo
Insulin Sensitivity
Effect of Vitamin D Replacement on Insulin Sensitivity
Healthy subjects with low Vitamin D levels will be randomly assigned to either Vitamin D replacement or placebo for a period of 8 weeks.
- Trial name
- NCT01268111
- Testing
- Ergocalciferols
- Where
- United States
- Volunteers
- 12 people, healthy volunteers welcome
- Sponsor
- Texas Tech University Health Sciences Center
Vitamin D Deficiency, Immunosuppression
Helminth Infection During Pregnancy on Vitamin D Regulation: HELMVIT Study
Purpose: To examine whether helminth infection during pregnancy alters Vitamin-D-metabolism and reactivity of the child's immune system Hypothesis: Helminth infection during pregnancy is associated with altered Vitamin D levels…
- Trial name
- HELMVIT (NCT04324853)
- Testing
- Microscopy ( Urine filtration), UCAA test, qPCR,, Microscopy (Kato Katz, Coproculture, Harada Mori, MIF), qPCR,
- Where
- Gabon
- Volunteers
- 180 people, healthy volunteers welcome
- Sponsor
- Centre de Recherche Médicale de Lambaréné
Vitamin D Deficiency
Challenges in Achieving Adequate Vitamin D Status in the Adult Population/ Part 2
The efficiency of different vitamin D formulations in treating suboptimal vitamin D status in adult population will be determined. It will provide insights into the influence of formulation on vitamin D absorption.
- Trial name
- VITAD/2 (NCT03810261)
- Testing
- Oil-based vitamin D, Water-based vitamin D, Vitamin D capsules
- Where
- Slovenia
- Volunteers
- 105 people, healthy volunteers welcome
- Sponsor
- Institute of Nutrition, Slovenia (Nutris)
Breast Cancer, Vitamin D Deficiency
Epidemiological Analysis of Vitamin D and Breast Cancer Risk in Saudi Arabian Women
This is an analysis of de-identified data collected from 240 Saudi Arabian women, 120 with breast cancer and 120 control women, to evalyate if vitamin D status is associated with breast cancer risk.
- Trial name
- NCT01817231
- Where
- United States
- Volunteers
- 240 people, healthy volunteers welcome
- Sponsor
- University of Arizona
Vitamin D Deficiency
Preoperative Vitamin D Levels and Respiratory Complications of General Anesthesia
Vitamin D deficiency is a commonly observed health problem in the world. With a role in many chronic diseases and especially lung diseases, the importance of vitamin D deficiency in anesthesia management is increased.
- Trial name
- VitaminD (NCT03342651)
- Testing
- Vitamin D
- Volunteers
- 95 people, healthy volunteers welcome
- Sponsor
- Ordu University
Vitamin D Deficiency
The Effect of Vitamin D3 Therapy on Vitamin D Status in Pregnant Women With Vitamin D Deficient and Insufficient
This study is a randomized controlled trial which compares the effect of vitamin D3 therapy 5,000 IU daily and 50,000 IU on 25(OH)D and 1,25(OH)2D, VDBP, and 24,25(OH)2D maternal serum levels in pregnant women with vitamin D…
- Trial name
- NCT06054919
- Testing
- Cholecalciferol
- Where
- Indonesia
- Volunteers
- 52 people, healthy volunteers welcome
- Sponsor
- Universitas Indonesia
Beta-carotene Bioavailability, Vitamin A Deficiency
Effect of SNPs in the BCMO1 Enzyme
Summary: Chronic intake of foods low in vitamin A (retinol) and provitamin A forming an unbalanced diet with little variety is common in young individuals in the United Kingdom (UK) population and can lead to subclinical…
- Trial name
- BETASNP2 (NCT02276014)
- Testing
- Beta-carotene
- Where
- United Kingdom
- Volunteers
- 85 people, healthy volunteers welcome
- Sponsor
- Newcastle-upon-Tyne Hospitals NHS Trust
Vitamin D Deficiency
Vitamin D Levels in Residents in Medicine
the study aims to messure the vitamin D levels in medical staff in the hospital. The physicians in the course of their internship who work indoors and work many night shifts have limited sun exposure in all seasons.
- Trial name
- NCT01118806
- Where
- Israel
- Volunteers
- 106 people, healthy volunteers welcome
- Sponsor
- Meir Medical Center
Vitamin D Deficiency
Vitamin D Supplementation in Children
Prevalence of vitamin D deficiency in children in the northern country during winter season is very high (up to 90%). Vitamin D supplementation at a dose 600 -1000 IU/d is recommended in Polish children from September till April.
- Trial name
- MeltD (NCT03402698)
- Testing
- cholecalciferol
- Where
- Poland
- Volunteers
- 73 people, healthy volunteers welcome
- Sponsor
- Children's Memorial Health Institute, Poland
Iron Deficiency, Anemia; Deficiency, Nutritional, With Poor Iron Absorption
A Study to Investigate the Effect of Vitamin D3 Supplementation on Iron Status in Iron Deficient Women
Iron is one of the most vital elements in humans as it plays a role in physiological functions such as transferring and storing oxygen, transporting electrons and catalysing numerous reactions, from oxidative metabolism to…
- Conditions
- Iron Deficiency, Anemia; Deficiency, Nutritional, With Poor Iron Absorption, Vitamin D Deficiency
- Trial name
- NCT02714361
- Testing
- Vitamin D3 supplement
- Where
- United Kingdom
- Volunteers
- 50 people, healthy volunteers welcome
- Sponsor
- University of Chester
Vitamin B12 Deficiency
Autoantibodies to Gastric Parietal Cells in Rheumatoid Arthritis Patients
A review of the literature reveals that very few studies have assessed the potential co-existence of vitamin B12 deficiency due to gastric parietal cell autoantibodies. While Segal et al.
- Trial name
- NCT01876329
- Where
- United States
- Volunteers
- 125 people, healthy volunteers welcome
- Sponsor
- Keesler Air Force Base Medical Center
Vitamin D Deficiency
Efficacy of Daily Vitamin D3 Supplementation in Normal Weight Adolescents
The study is designed to evaluate the increment of serum 25 (OH) vitamin D levels in normal weight adolescents following a 12-week supplementation with Vitamin D3 2000 IU/day.
- Trial name
- NCT01058720
- Testing
- Vitamin D3
- Where
- United States
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- Mayo Clinic
Vitamin A Deficiency
Using Stable Isotope Techniques to Monitor and Assess the Vitamin A Status of Children Susceptible to Infection
The combination of infectious diseases and malnutrition is the most prevalent, preventable public health problem in the world, responsible for millions of deaths annually, particularly in infants and children.
- Trial name
- NCT02363985
- Testing
- Mega-dose of vitamin A supplement
- Where
- Ethiopia
- Volunteers
- 138 people, healthy volunteers welcome
- Sponsor
- Ethiopian Public Health Institute