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TrialConditionsStatusPhaseUpdatedMore infoNCT ID
The VITDALIZE Study: Effect of High-dose Vitamin D3 on 28-day Mortality in Adult Critically Ill PatientsCOVID-19, Coronaviridae Infections, Critical Illness, Disease Attributes, Infections, Nidovirales infectious disease, Nutritional and Metabolic Diseases, Orthocoronavirinae infectious disease, Pathologic Processes, Pathological Conditions, Signs and Symptoms, RNA Virus Infections, lung disorder, nutritional deficiency disease, nutritional disorder, pneumonia, respiratory system disorder, respiratory tract infectious disorder, viral infectious disease, viral pneumonia, vitamin D deficiency, vitamin deficiency disorderActive, not recruitingPhase 32026-10-09NCT03188796
Vitamin D Status and Its Influencing Factors in Zhejiang Province: A Multicenter Cross-Sectional StudyNutritional and Metabolic Diseases, nutritional deficiency disease, nutritional disorder, vitamin D deficiency, vitamin deficiency disorderEnrolling by invitationNot stated2026-10-08NCT07866391
Clinical and Laboratory Study of Methylmalonic AcidemiaCongenital, Hereditary, and Neonatal Diseases and Abnormalities, Nutritional and Metabolic Diseases, hereditary disease, hyperhomocysteinemia, inborn disorder of amino acid metabolism, inborn errors of metabolism, inborn organic aciduria, malabsorption syndrome, metabolic disease, methylmalonic acidemia, nutritional deficiency disease, nutritional disorder, vitamin B deficiency, vitamin deficiency disorderRecruitingNot stated2026-10-08NCT00078078
A Natural History Study of Bone and Mineral DisordersBone Diseases, Metabolic, Nutritional and Metabolic Diseases, bone disorder, calcium metabolic disease, familial tumoral calcinosis, metabolic disease, musculoskeletal system disorder, nutritional deficiency disease, nutritional disorder, osteomalacia, osteoporosis, rickets, vitamin D deficiency, vitamin deficiency disorderRecruitingNot stated2026-10-08NCT00024804
Bone Myoregulation Reflex and Postural Control in Vitamin D DeficiencyNutritional and Metabolic Diseases, nutritional deficiency disease, nutritional disorder, vitamin D deficiency, vitamin deficiency disorderRecruitingNot stated2026-10-06NCT07435935
Osteoporosis & Renal Disease: Research in Primary Health Care ServicesBone Diseases, Metabolic, Chronic Disease, Disease Attributes, Female Urogenital Diseases, Female Urogenital Diseases and Pregnancy Complications, Male Urogenital Diseases, Nutritional and Metabolic Diseases, Pathologic Processes, Pathological Conditions, Signs and Symptoms, Urogenital Diseases, bone disorder, calcium metabolic disease, chronic renal failure syndrome, endocrine system disorder, hyperparathyroidism, kidney disorder, kidney failure, metabolic disease, musculoskeletal system disorder, nutritional deficiency disease, nutritional disorder, osteoporosis, parathyroid gland disorder, renal osteodystrophy, rickets, secondary hyperparathyroidism, urinary system disorder, vitamin D deficiency, vitamin deficiency disorderNot yet recruitingNot stated2026-09-30NCT07848490
Effects of Vitamin D on Health Promotion During Pregnancy and Its Impact on Prematurity-Related OutcomeFemale Urogenital Diseases and Pregnancy Complications, Nutritional and Metabolic Diseases, Obstetric Labor Complications, Obstetric Labor, Premature, Premature Birth, Urogenital Diseases, nutritional deficiency disease, nutritional disorder, pregnancy disorder, vitamin D deficiency, vitamin deficiency disorderActive, not recruitingNot stated2026-09-30NCT06292195
Preoperative Correction of Vitamin D Deficiency in Total Joint Arthroplasty (TJA)Nutritional and Metabolic Diseases, arthritic joint disease, arthropathy, musculoskeletal system disorder, nutritional deficiency disease, nutritional disorder, osteoarthritis, rheumatic disorder, vitamin D deficiency, vitamin deficiency disorderActive, not recruitingPhase 42026-09-23NCT07006714
A First-in-human Study of KK8123 in Adults With X-linked HypophosphatemiaBone Diseases, Metabolic, Congenital, Hereditary, and Neonatal Diseases and Abnormalities, Disease Attributes, Female Urogenital Diseases, Female Urogenital Diseases and Pregnancy Complications, Hypophosphatemia, Familial, Male Urogenital Diseases, Nutritional and Metabolic Diseases, Pathologic Processes, Pathological Conditions, Signs and Symptoms, Rare Diseases, Rickets, X-Linked Hypophosphatemic, Urogenital Diseases, X-linked hypophosphatemic rickets, bone disorder, calcium metabolic disease, hereditary disease, hypophosphatemia, hypophosphatemic rickets, inborn errors of metabolism, inborn metal metabolism disorder, kidney disorder, metabolic disease, musculoskeletal system disorder, nutritional deficiency disease, nutritional disorder, phosphorus metabolism disease, renal tubular transport disease, rickets, urinary system disorder, vitamin D deficiency, vitamin deficiency disorderRecruitingPhase 1 / Phase 22026-09-21NCT06525636
A Long-term Observational Study to Describe the Use of Vitamin-C Injektopas® 7.5 g in Patients With Vitamin C DeficiencyChronic Disease, Disease Attributes, Nutritional and Metabolic Diseases, Pathologic Processes, Pathological Conditions, Signs and Symptoms, acute disease, nutritional deficiency disease, nutritional disorder, scurvy, vitamin deficiency disorderRecruitingNot stated2026-09-17NCT06983847
The CPH-MBD CohortBone Diseases, Metabolic, Chronic Disease, Disease Attributes, Female Urogenital Diseases, Female Urogenital Diseases and Pregnancy Complications, Male Urogenital Diseases, Nutritional and Metabolic Diseases, Pathologic Processes, Pathological Conditions, Signs and Symptoms, Urogenital Diseases, bone disorder, calcium metabolic disease, chronic renal failure syndrome, endocrine system disorder, hyperparathyroidism, kidney disorder, kidney failure, metabolic disease, musculoskeletal system disorder, nutritional deficiency disease, nutritional disorder, parathyroid gland disorder, renal osteodystrophy, rickets, secondary hyperparathyroidism, urinary system disorder, vitamin D deficiency, vitamin deficiency disorderRecruitingNot stated2026-09-16NCT07193056
Medium Cut-Off and High-Flux Membranes on Mineral and Bone Metabolism in Hemodialysis PatientsBone Diseases, Metabolic, Chronic Disease, Disease Attributes, Female Urogenital Diseases, Female Urogenital Diseases and Pregnancy Complications, Male Urogenital Diseases, Nutritional and Metabolic Diseases, Pathologic Processes, Pathological Conditions, Signs and Symptoms, Urogenital Diseases, bone disorder, calcium metabolic disease, chronic renal failure syndrome, endocrine system disorder, hyperparathyroidism, kidney disorder, kidney failure, metabolic disease, musculoskeletal system disorder, nutritional deficiency disease, nutritional disorder, parathyroid gland disorder, renal osteodystrophy, rickets, sclerosteosis, secondary hyperparathyroidism, urinary system disorder, vitamin D deficiency, vitamin deficiency disorderActive, not recruitingNot applicable2026-09-14NCT07685223
OPI-NXYDLD-303 Safety and Efficacy of Phentolamine Ophthalmic Solution in Keratorefractive Surgery Participants With Decreased Mesopic Visual AcuityNeurologic Manifestations, Nutritional and Metabolic Diseases, Pathological Conditions, Signs and Symptoms, Sensation Disorders, Signs and Symptoms, eye disorder, nervous system disorder, nutritional deficiency disease, nutritional disorder, vision disorder, vitamin A deficiency, vitamin deficiency disorderRecruitingPhase 32026-09-08NCT07140783
The OK Daily StudyCongenital, Hereditary, and Neonatal Diseases and Abnormalities, Hemic and Lymphatic Diseases, Infant Nutrition Disorders, Infant, Newborn, Diseases, Nutritional and Metabolic Diseases, blood coagulation disease, hematologic disorder, hemorrhagic disease, hemorrhagic disease of newborn, nutritional deficiency disease, nutritional disorder, vitamin K deficiency hemorrhagic disease, vitamin deficiency disorderNot yet recruitingNot applicable2026-09-04NCT07620236
Local and Systemic Inflammatory Bone Alterations Related to Dental Implant Survival.Chronic Disease, Disease Attributes, Female Urogenital Diseases, Female Urogenital Diseases and Pregnancy Complications, Male Urogenital Diseases, Nutritional and Metabolic Diseases, Pathologic Processes, Pathological Conditions, Signs and Symptoms, Peri-Implantitis, Renal Insufficiency, Acute, Stomatognathic Diseases, Urogenital Diseases, acute kidney injury, chronic renal failure syndrome, diabetes mellitus, endocrine system disorder, glucose metabolism disease, kidney disorder, kidney failure, metabolic disease, mouth disorder, nutritional deficiency disease, nutritional disorder, periodontal disorder, urinary system disorder, vitamin D deficiency, vitamin deficiency disorderActive, not recruitingNot stated2026-08-31NCT07766707
Impact of Vitamin D Supplementation on the Rate of Pathologic Complete Response in Vitamin D Deficient PatientsNeoplasms by Site, Nutritional and Metabolic Diseases, Skin and Connective Tissue Diseases, breast disorder, breast neoplasm, invasive breast carcinoma, neoplasm, nutritional deficiency disease, nutritional disorder, skin disorder, triple-negative breast carcinoma, vitamin D deficiency, vitamin deficiency disorderRecruitingPhase 22026-08-28NCT04677816
X-linked Hypophosphatemia Disease Monitoring ProgramBone Diseases, Metabolic, Congenital, Hereditary, and Neonatal Diseases and Abnormalities, Female Urogenital Diseases, Female Urogenital Diseases and Pregnancy Complications, Hypophosphatemia, Familial, Male Urogenital Diseases, Nutritional and Metabolic Diseases, Rickets, X-Linked Hypophosphatemic, Urogenital Diseases, X-linked hypophosphatemic rickets, bone disorder, calcium metabolic disease, hereditary disease, hypophosphatemia, hypophosphatemic rickets, inborn errors of metabolism, inborn metal metabolism disorder, kidney disorder, metabolic disease, musculoskeletal system disorder, nutritional deficiency disease, nutritional disorder, phosphorus metabolism disease, renal tubular transport disease, rickets, urinary system disorder, vitamin D deficiency, vitamin deficiency disorderActive, not recruitingNot stated2026-08-28NCT03651505
Study of Choline Chloride for Injection in Adolescent and Adult Patients With Intestinal Failure Receiving Long Term Parenteral SupportDigestive System Diseases, Hyperphagia, Intestinal Failure, Nutritional and Metabolic Diseases, Pathological Conditions, Signs and Symptoms, Signs and Symptoms, Signs and Symptoms, Digestive, choline deficiency disease, digestive system disorder, intestinal disorder, nutritional deficiency disease, nutritional disorder, vitamin B deficiency, vitamin deficiency disorderRecruitingPhase 2 / Phase 32026-08-24NCT06910943
Vitamin A Supplementation in Allogeneic Stem Cell Transplantation.Nutritional and Metabolic Diseases, graft versus host disease, immune system disorder, nutritional deficiency disease, nutritional disorder, vitamin A deficiency, vitamin D deficiency, vitamin deficiency disorderRecruitingPhase 22026-08-24NCT06450925
Evaluation of the Clinical and Psychological Impact of Vitamin D Replacement in Adolescent Females at Risk for Polycystic Ovarian Syndrome (PCOS)Nutritional and Metabolic Diseases, nutritional deficiency disease, nutritional disorder, vitamin D deficiency, vitamin deficiency disorderRecruitingNot applicable2026-08-20NCT04355572
Vitamin D Status and Clinical Outcomes in Locally Advanced Cervical CancerNutritional and Metabolic Diseases, injury, nutritional deficiency disease, nutritional disorder, radiation injury, vitamin D deficiency, vitamin deficiency disorderRecruitingNot stated2026-08-04NCT07743918
Vitamin D2 vs Vitamin D2 Plus Calcitriol in Cholestatic Children With Vitamin D DeficiencyDigestive System Diseases, Nutritional and Metabolic Diseases, bile duct disorder, biliary tract disorder, cholestasis, nutritional deficiency disease, nutritional disorder, vitamin D deficiency, vitamin deficiency disorderRecruitingPhase 42026-08-03NCT07670611
Vitamin A Supplementation and Breast Milk Vitamin A Levels in Mothers of Preterm InfantsFemale Urogenital Diseases and Pregnancy Complications, Nutritional and Metabolic Diseases, Obstetric Labor Complications, Obstetric Labor, Premature, Premature Birth, Urogenital Diseases, nutritional deficiency disease, nutritional disorder, pregnancy disorder, vitamin A deficiency, vitamin deficiency disorderNot yet recruitingNot applicable2026-07-30NCT07736768
Vitamin D Status and Asthma Control, Pulmonary Function, and Oxidative Stress in Adults With Bronchial AsthmaHypersensitivity, Immediate, Nutritional and Metabolic Diseases, Respiratory Hypersensitivity, asthma, bronchial disorder, immune system disorder, lung disorder, nutritional deficiency disease, nutritional disorder, obstructive lung disease, respiratory system disorder, vitamin D deficiency, vitamin deficiency disorderNot yet recruitingNot stated2026-07-29NCT07733635
Vitamin D Status and Lipid Profile in Obese Adults With Type 2 DiabetesBody Weight, Dyslipidemias, Lipid Metabolism Disorders, Nutritional and Metabolic Diseases, Overweight, Pathological Conditions, Signs and Symptoms, Signs and Symptoms, diabetes mellitus, endocrine system disorder, glucose metabolism disease, metabolic disease, nutritional deficiency disease, nutritional disorder, obesity disorder, overnutrition, type 2 diabetes mellitus, vitamin D deficiency, vitamin deficiency disorderNot yet recruitingNot stated2026-07-27NCT07729553