Vitamin D Deficiency: all 784 studies

Page 4 of 8. Open to participants first (61), then studies with results posted, then the rest; newest registration first within each.

• Clinical Outcomes of High Dose Vitamin D Versus Standard Dose in COVID-19 Egyptian PatientsCompletedNCT04738760
• Efficacy and Safety of Calcifediol vs Placebo in Subjects With Vitamin D DeficiencyCompletedNCT04735926Phase 2/3
• Vitamin D Status in Children With Sickle Cell Disease Living in Lyon, FranceCompletedNCT04694976
• Vitamin D Levels and Postoperative Pain in Laparoscopic CholecystectomyCompletedNCT04687527
• Vitamin D Supplementation in Individuals With a Chronic Spinal Cord InjuryCompletedNCT04652544Phase 3
• Vitamin D Deficiency in Coronary Artery DiseaseCompletedNCT04651101
• 25- Hydroxyvitamin D Levels in Pregnancy and Effects on Pregnancy Related DisordersCompletedNCT04637880
• Baseline Vitamin D Deficiency and COVID-19 Disease SeverityCompletedNCT04628000
• Effect of Vitamin D Supplementation on Infliximab Response in Patients With Crohn's DiseaseCompletedNCT04606017
• Effect of Vitamin d Deficiency in Chronic Rhinosinusitis With Nasal PolyposisStatus unknownNCT04529668Phase 1
• High Dose Vitamin-D Substitution in Patients With COVID-19: a Randomized Controlled, Multi Center StudyCompletedNCT04525820Not applicable
• Vitamin D Supplementation in the Prevention and Mitigation of COVID-19 InfectionActive, not recruitingNCT04482673Phase 4
• Omega 3 and Vitamin D Dosage in a Population With Moderate to High Risk of AMDCompletedNCT04482465Not applicable
• Influence of Military Preventive Policy for reCruit Training on COVID-19 SeroconversionStatus unknownNCT04476680Not applicable
• The Efficacy and the Safety of Vitamin D3 30,000 IU for Loading Dose SchedulesCompletedNCT04476511Phase 3
• SUN LIGHT EXPOSURE AND VITAMIN D LEVEL IN NURSING HOMECompletedNCT04469257Not applicable
• Effects of Vitamin D Supplementation on Immune Function in InfantsCompletedNCT04461665Not applicable
• Does Supplementing Vitamin D Deficiency Affect Fusion Healing Rates in Elective Foot and Ankle Surgery?CompletedNCT04450199Early Phase 1
• The Effect of Preoperative Oral Dexamethasone Supplementation on the Outcome of Thyroidectomised Patients.Status unknownNCT04412694Phase 4
• Evaluation of the Relationship Between Zinc Vitamin D and b12 Levels in the Covid-19 Positive Pregnant WomenCompletedNCT04407572
• Vitamin D Testing and Treatment for COVID 19CompletedNCT04407286Phase 1
• Uroflowmetry Results and Vitamin D LevelsCompletedNCT04405141
• Development of a Screening Tool for the Risk of Vitamin D DeficiencyStatus unknownNCT04404842
• Increased Risk of Severe Coronavirus Disease 2019 in Patients With Vitamin D DeficiencyCompletedNCT04403932
• Replenishing and Maintaining Vitamin D Status in Older Adults in Residential Care Facilities in NISuspendedNCT04395638Not applicable
• Vitamin D Levels in SARS-CoV-2: Do Current Adequacy Thresholds Reflect Clinical Risk? Insights From a Large Turkish CohortCompletedNCT04394390
• Relationship Between Body Composition, Food Consumption, and Micro and Macronutrients With Gene Expression in Breast CancerStatus unknownNCT04389424
• Investigating the Role of Vitamin D in the Morbidity of COVID-19 PatientsCompletedNCT04386044
• High vs Low Dose Vitamin D in Patients With Diabetic Peripheral NeuropathyCompletedNCT04377399Phase 4
• Efficacy of Oral Vitamin D Supplementation in Adolescents and Young Adults.CompletedNCT04377386Not applicable
• The LEAD COVID-19 Trial: Low-risk, Early Aspirin and Vitamin D to Reduce COVID-19 HospitalizationsWithdrawnNCT04363840Phase 2
• Vitamin D Supplementation in ConscriptsCompletedNCT04359524Not applicable
• Helminth Infection During Pregnancy on Vitamin D Regulation: HELMVIT StudyCompletedNCT04324853
• Effect of Aerobic Interval Training With Vitamin D Supplement on Functional Capacity and Perceived MyalgiaCompletedNCT04319289Not applicable
• Observation of the Effect of Vitamin D Supplementation on Chronic Course of Patients With Ulcerative Colitis Based on Vitamin D Receptor Fok I Gene PolymorphismStatus unknownNCT04309058Early Phase 1
• Exploring the Effects of Vitamin D Supplementation on the Chronic Course of Patients With Crohn's Disease With Vitamin D DeficiencyStatus unknownNCT04308850Early Phase 1
• The Effects of Vitamin D3 Alone and in a Combination With Omega-3 on the Association of C-peptide With Glycemic ControlCompletedNCT04307784Not applicable
• Effects of Enteral Supplement Vitamin D Incritically Ill PatientsCompletedNCT04292873Not applicable
• Prospective, Assessment of Vitamin D and Calcium Supplementation, Improvement of Nutritional Status and Preoperative Rehabilitation in Patients Before Knee Arthroplasty.CompletedNCT04291833Not applicable
• Vitamin D in PregnancyStatus unknownNCT04291313Not applicable
• A Retrospective Analysis: the Influence of Caltrate Supplement on the Effect of Mesalazine in Ulcerative ColitisCompletedNCT04276649
• Exploring the Effects of Caltrate Supplement on the Chronic Course of Crohn's Disease Patients With Vitamin D DeficiencyStatus unknownNCT04276636Early Phase 1
• Effect of Vitamin D Supplementation on Improvement of Pneumonic ChildrenStatus unknownNCT04244474Phase 1/2
• Effect of Vitamin D on Periodontal DiseaseCompletedNCT04209231
• Vitamin D Enriched Meat Project (Acute Study)CompletedNCT04207294Not applicable
• Relationship Between Serum Vitamin D Levels and Musculoskeletal Adverse Effects in Patients Using IsotretinoinCompletedNCT04204304Not applicable
• Effect of Escalating Oral Vitamin D Replacement on HOMA-IR in Vitamin D Deficient Type 2 DiabeticsCompletedNCT04183257Phase 4
• Innovative Food Structures to Enhance Nutrient BioavailabilityCompletedNCT04156074Not applicable
• the Effect of Vitamin D in Crohn's DiseaseStatus unknownNCT04134065Early Phase 1
• Treatment of Vitamin D Deficiency With Large Bolus CholecalciferolTerminatedNCT04120064Phase 1
• A Study to Investigate the Effect of Vitamin D3 Supplementation on Asthma Symptoms in Adults With Asthma (VITDAS)CompletedNCT04117581Not applicable
• Vitamin D Deficiency and Effect of Its Supplementation on Interstitial Lung Diseases(ILD).Status unknownNCT04100226Not applicable
• Vitamin D Supplementation to Correct the Vitamin D Deficiency for Breast CancerCompletedNCT04091178Phase 2
• Vitamin D in Systemic Sclerosis Patients With PeriodontitisCompletedNCT04066842
• Vitamin D in Fatty Liver DiseaseCompletedNCT04038853Phase 4
• Vitamin D Supplementation D_SAF Pilot StudyCompletedNCT04033796Not applicable
• Vitamin D Deficit in Women With Uterine FibroidsCompletedNCT04030182
• Vitamin D for Polycystic Ovary Syndrome Clomiphene Resistant WomenCompletedNCT04010942Phase 4
• Effect of Vitamin d and Omega 3 on OsteocalcinCompletedNCT04005612Not applicable
• The Combined Effect of Omega-3 Fatty Acid and Vitamin D3 on Lipid Profile Levels and Oxidized Low Density LipoproteinCompletedNCT04005573Not applicable
• A Trial to Evaluate the Effect of Vitamin D Supplementation in Patients With Chronic UrticariaStatus unknownNCT03991845Phase 4
• Effect of Vitamin D on the Size of Fibroids in Women With Vitamin D DeficiencyCompletedNCT03991078
• Vitamin D Can Increase Pathological Response of the Breast Cancer Patients Treated With Neoadjuvant TherapyCompletedNCT03986268Not applicable
• Effects of Vitamin D3 Supplementation on Antioxidant Enzymes Status in Vitamin D3 Deficient Asthma COPD Overlap (ACO) PatientsStatus unknownNCT03931889Not applicable
• Vitamin D 24'000 IU for Oral Intermittent SupplementationCompletedNCT03920150Phase 3
• Immunomodulatory Vitamin D in ThalassemiaCompletedNCT03919812Not applicable
• Vitamin D in Ectopic PregnanciesCompletedNCT03894735
• The Effect of Vitamin D on FertilityCompletedNCT03890458Phase 4
• Vitamin D Level and Its Relation to Pre-eclampsia and EclampsiaStatus unknownNCT03882099
• Effects of Fat-soluble Vitamins Supplementation on Common Complications and Neural Development in Very Low Birth Weight InfantsStatus unknownNCT03876704Phase 3
• Vitamin D in Periodontal and Cardiovascular Disease ProgressionCompletedNCT03873935
• Vitamin D Levels And Myoma UteriCompletedNCT03871868
• Vitamin D and Human Sperm DNA FragmentationStatus unknownNCT03829943
• Vitamin D Levels in Adolescent Idiopathic ScoliosisCompletedNCT03820895
• Vitamin D Treatment of Diabetic Patients With Foot UlcersCompletedNCT03813927Not applicable
• Challenges in Achieving Adequate Vitamin D Status in the Adult Population/ Part 2CompletedNCT03810261Not applicable
• The Effect of Calcium and Vitamin D Supplements on Metabolic and Hormonal Disturbances in Polycystic Ovary Syndrome PatientsCompletedNCT03792984Phase 3
• The Influence of Food Matrix Delivery System on the Bioavailability of Vitamin D3CompletedNCT03783273Not applicable
• Effect of Vitamin D Supplementation on Inflammatory MarkersCompletedNCT03782805Not applicable
• Impact of Vitamin D3 Administration on Cardiac Autonomic Tone in Asthma Chronic Obstructive Pulmonary Disease(COPD) Overlap PatientsCompletedNCT03773809Not applicable
• Rapid Normalization of Vitamin D Deficiency in PICUCompletedNCT03742505Phase 3
• Effect of Vitamin D3 and Omega-3FA on Leptin and HbA1C With Vitamin D DeficiencyCompletedNCT03735303Not applicable
• PK/PD of Vitamin D3 in Adults With CFTerminatedNCT03734744Not applicable
• D Vitamin Effects on Neuromuscular Blocker Reverse TimeCompletedNCT03734250
• Can Vitamin D Supplementation in People With Crohn's Disease Improve Symptoms as an Adjunct Therapy?Status unknownNCT03718182Phase 4
• Stability of Dental Implants Placed in Patients With Vitamin D Deficiency Using Sequential Drilling Versus a New One Single Drilling DesignCompletedNCT03695562Phase 4
• Nutritional Status and Hidradenitis Suppurativa (Acne Inversa)CompletedNCT03683238
• The Relation Between Vitamin D and Gestational Diabetes MellitusCompletedNCT03665974
• Endocrine and Menstrual Disturbances in Women With Polycystic Ovary Syndrome (PCOS)SuspendedNCT03652987
• Vitamin D and Arterial Stiffness in ElderlyCompletedNCT03649802Phase 2
• Cholecalciferol Supplementation Effect on Parathyroid Hormone in Hemodialysis PatientsCompletedNCT03648528Phase 4
• Prevalence of Deficiency of Vitamin D in Critically Ill PatientsCompletedNCT03639584
• Correlation Between Maternal Vitamin D Level And Preterm BirthStatus unknownNCT03638037
• Maintenance Dosing of Vitamin D in Crohn's DiseaseTerminatedNCT03615378Early Phase 1
• High-dose Vitamin D Supplements in Older AdultsActive, not recruitingNCT03613116Phase 2
• Improving Functionality in Older PeopleTerminatedNCT03611049Phase 2
• Vitamin D and Immunity: Photosynthesis Versus SupplementationCompletedNCT03609970Not applicable
• Cholecalciferol on Hemodialysis PatientsCompletedNCT03602430Phase 2/3
• Prognostic Value of Vitamin D Levels in Egyptian Females With Breast CancerStatus unknownNCT03594214
• Association Between Vitamin D and the Risk of Uterine FibroidsStatus unknownNCT03586947Not applicable

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