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Showing 1–24 of 635 matching trials from the live ClinicalTrials.gov search.
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Completed Not applicable Interventional

Interaction of Cobalamin Status With Nitrous Oxide in Relation to Postoperative Cognitive Changes in the Elderly

NCT00212147
View directory record Official record
Conditions
Avitaminosis, Delirium, Dementia, Amnestic, Cognitive Disorders
Interventions
General anesthesia with nitrous oxide, General anesthesia without nitrous oxide
Drug
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
60 Years and older
Enrollment
444 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2008
U.S. locations
2
States / cities
Brooklyn, New York • New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 7, 2022 · Synced Sep 3, 2026, 7:01 PM EDT
Completed No phase listed Observational

Clinical Outcomes, Nutritional Status, Exercise and Psychosocial Factors in Pediatric Hematopoietic Cell Transplant

NCT02734797
View directory record Official record
Conditions
Malnutrition, Obesity
Interventions
Not listed
Lead sponsor
University of Michigan Rogel Cancer Center
Other
Eligibility
2 Years to 25 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Jan 24, 2024 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Different Vitamin D Preparations & FGF23 in Humans

NCT00957879
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Ergocalciferol, Calcitriol
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 45 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 18, 2012 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Keiki (Pediatric) Produce Prescription (KPRx) Program Hawaii

NCT05442424
View directory record Official record
Conditions
Malnutrition, Child, Obesity, Food Selection, Nutrition Poor
Interventions
Produce Voucher, Wait-List Control
Behavioral
Lead sponsor
University of Hawaii
Other
Eligibility
2 Years to 8 Years
Enrollment
170 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Honolulu, Hawaii
Source: ClinicalTrials.gov public record
Updated Mar 29, 2025 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Absorbance Study - Clinical Trial of the Absorbance of Nano Liquid D3

NCT04885803
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Softgel Vitamin D3, Nano Liquid Vitamin D3, 25(OH)D Blood Serum Test, Placebo Control
Dietary Supplement · Diagnostic Test · Other
Lead sponsor
Inspired Life Medical, Inc.
Industry
Eligibility
18 Years to 70 Years
Enrollment
114 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Le Sueur, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 23, 2021 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D, Diet and Activity Study

NCT01240213
View directory record Official record
Conditions
Breast Cancer, Obesity, Hypovitaminosis D
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Fred Hutchinson Cancer Center
Other
Eligibility
50 Years to 75 Years · Female only
Enrollment
218 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Aug 6, 2013 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin D Status on Bones in Breastfed Infants

NCT00697294
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Tri-Vi-Sol
Dietary Supplement
Lead sponsor
Baylor College of Medicine
Other
Eligibility
Up to 2 Hours
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2011
U.S. locations
3
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Dec 4, 2011 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Healthy Lifestyle Intervention for High-Risk Minority Pregnant Women

NCT03416010
View directory record Official record
Conditions
Emotional Disturbances, Depression, Pregnancy Late, Post-Partum Depression, Anxiety, Nutritional Deficiency
Interventions
COPE-P
Behavioral
Lead sponsor
Ohio State University
Other
Eligibility
18 Years to 40 Years · Female only
Enrollment
299 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2023
U.S. locations
3
States / cities
The Bronx, New York • Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 17, 2025 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Not applicable Interventional Results available

Effect Of Biomechanical Stimulation On Skeletal Health In Adolescent And Young Women With Anorexia Nervosa

NCT01100567
View directory record Official record
Conditions
Anorexia Nervosa
Interventions
Low-magnitude mechanical stimulation platform
Device
Lead sponsor
Boston Children's Hospital
Other
Eligibility
11 Years to 25 Years · Female only
Enrollment
101 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 16, 2017 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Improving the Understanding of the Response to Vitamin D Supplementation

NCT01465178
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
50 Years to 100 Years · Female only
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 24, 2016 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assessment of Vitamin D Supplementation and Immune Function

NCT01399151
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D - Treatment 1, Vitamin D - Treatment 2, Vitamin D - Treatment 3
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
20 Years to 49 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Apr 21, 2014 · Synced Sep 3, 2026, 7:01 PM EDT
Completed No phase listed Observational

Adding Malabsorption for Failed Gastric Bypass

NCT01040481
View directory record Official record
Conditions
Clinically Severe Obesity, Obesity Recidivism, Inadequate Initial Weight Loss, Poor Weight Loss, Persistent Obesity, Refractory Obesity, Intractable Obesity
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 65 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Fresno, California
Source: ClinicalTrials.gov public record
Updated Dec 28, 2009 · Synced Sep 3, 2026, 7:01 PM EDT
Completed No phase listed Observational

Pathogenesis of Compromised Bone Quality and Mechanics in Chronic Kidney Disease

NCT03626246
View directory record Official record
Conditions
Chronic Kidney Disease, End Stage Kidney Disease, Chronic Kidney Disease Mineral and Bone Disorder, Renal Osteodystrophy, Secondary Hyperparathyroidism
Interventions
Kidney disease
Other
Lead sponsor
Columbia University
Other
Eligibility
40 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 12, 2021 · Synced Sep 3, 2026, 7:01 PM EDT
Recruiting Not applicable Interventional

Copper Supplementation in Cirrhosis

NCT07471542
View directory record Official record
Conditions
Cirrhosis, Chronic Liver Disease, Fibrosis, Infection
Interventions
Copper Gluconate
Dietary Supplement
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Mar 12, 2026 · Synced Sep 3, 2026, 7:01 PM EDT
Recruiting Phase 4 Interventional

Safety Study of SMOFlipid to Evaluate the Risk of Developing EFAD and/or PNAC in Pediatric and Adult Patients

NCT06049680
View directory record Official record
Conditions
Malnutrition, Child, Malnutrition, Essential Fatty Acid Deficiency (EFAD), Parenteral Nutrition Associated Cholestasis
Interventions
SMOFlipid® (lipid injectable emulsion)
Drug
Lead sponsor
Fresenius Kabi
Industry
Eligibility
1 Month to 17 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
5
States / cities
Atlanta, Georgia • Chicago, Illinois • Indianapolis, Indiana + 2 more
Source: ClinicalTrials.gov public record
Updated Jul 16, 2026 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Early Phase 1 Interventional Results available

Calcitriol Monotherapy for X-Linked Hypophosphatemia

NCT03748966
View directory record Official record
Conditions
X-linked Hypophosphatemia, Hypophosphatemic Rickets, Hypophosphatemic Rickets, X-Linked Dominant
Interventions
Calcitriol
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
3 Years to 70 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 6, 2026 · Synced Sep 3, 2026, 7:01 PM EDT
Completed No phase listed Observational

Vitamin D Deficiency in Obese Adolescent Girls and Influence of Vitamin D on Insulin Secretion and Sensitivity

NCT00850694
View directory record Official record
Conditions
Vitamin D Deficiency, Obesity, Insulin Resistance
Interventions
Not listed
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
10 Years to 18 Years · Female only
Enrollment
114 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Apr 9, 2017 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

The Effect of SLC19A3 Inhibition on the Pharmacokinetics of Thiamine

NCT03746106
View directory record Official record
Conditions
Vitamin B1 Deficiency, Thiamine Deficiency
Interventions
Trimethoprim, Metformin, Vitamin B1
Drug · Dietary Supplement
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 65 Years
Enrollment
7 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2023
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 2, 2025 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D and Adipose Tissue Inflammation

NCT01477034
View directory record Official record
Conditions
Vitamin D Deficiency, Obesity, Type 2 Diabetes Mellitus, Intestinal Permeability
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Fred Hutchinson Cancer Center
Other
Eligibility
18 Years to 65 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Apr 3, 2014 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Open-Label Study of Asfotase Alfa in Infants and Children ≤ 5 Years of Age With Hypophosphatasia (HPP)

NCT01176266
View directory record Official record
Conditions
Hypophosphatasia
Interventions
asfotase alfa
Drug
Lead sponsor
Alexion Pharmaceuticals, Inc.
Industry
Eligibility
1 Minute to 5 Years
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
3
States / cities
Oakland, California • Cincinnati, Ohio • Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 12, 2019 · Synced Sep 3, 2026, 7:01 PM EDT
Completed No phase listed Observational

Small Bowel Length and Bariatric Surgery Outcomes

NCT02872493
View directory record Official record
Conditions
Malnutrition, Obesity, Weight Loss, Micronutrient Deficiency
Interventions
Small bowel length measurement
Procedure
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
470 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2025
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 7, 2025 · Synced Sep 3, 2026, 7:01 PM EDT
Recruiting No phase listed Observational

Precision Medicine Approaches to Renal Osteodystrophy

NCT05880914
View directory record Official record
Conditions
Renal Osteodystrophy, Chronic Kidney Diseases, CKD-MBD, Bone Turnover Rate Disorder, Secondary Hyperparathyroidism
Interventions
miRNAseq analysis, Standard treatment for bone disorder
Procedure · Drug
Lead sponsor
Thomas Nickolas
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety of Vitamin D Supplementation in Older Persons

NCT00681590
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol (vitamin D)
Dietary Supplement
Lead sponsor
University of Miami
Other
Eligibility
65 Years to 95 Years
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jan 25, 2017 · Synced Sep 3, 2026, 7:01 PM EDT
Completed Phase 3 Interventional

Hepatic Dysfunction, Vitamin D Status, and Glycemic Control in Diabetes

NCT02132442
View directory record Official record
Conditions
Type 2 Diabetes, Nonalcoholic Fatty Liver Disease, Vitamin D Deficiency
Interventions
Ergocalciferol, placebo
Dietary Supplement
Lead sponsor
University of Massachusetts, Worcester
Other
Eligibility
10 Years to 50 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 9, 2017 · Synced Sep 3, 2026, 7:01 PM EDT