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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Undernutrition Clear all
Recruiting No phase listed Observational Accepts healthy volunteers

Clinical and Laboratory Study of Methylmalonic Acidemia

NCT00078078
View directory record Official record
Conditions
Organic Acidemia, Methylmalonic Acidemia, Inborn Errors of Metabolism
Interventions
Not listed
Lead sponsor
National Human Genome Research Institute (NHGRI)
NIH
Eligibility
1 Month to 115 Years
Enrollment
2,275 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2004
U.S. locations
3
States / cities
Washington D.C., District of Columbia • Bethesda, Maryland • Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 10, 2026 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Not applicable Interventional

The Effect of Higher Protein Dosing in Critically Ill Patients

NCT03160547
View directory record Official record
Conditions
Critical Illness, Malnutrition
Interventions
Usual Protein/Amino Acid Group, Higher Protein/Amino Acid Group
Other
Lead sponsor
Clinical Evaluation Research Unit at Kingston General Hospital
Other
Eligibility
18 Years and older
Enrollment
1,329 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
21
States / cities
Phoenix, Arizona • Long Beach, California • Evanston, Illinois + 17 more
Source: ClinicalTrials.gov public record
Updated Mar 27, 2022 · Synced Jun 26, 2026, 5:38 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Personalized Nutrition During Pregnancy

NCT07508709
View directory record Official record
Conditions
Nutrition, Healthy, Nutrition Poor, Pregnancy Related
Interventions
Ninemoons app
Other
Lead sponsor
Olivia Sher
Other
Eligibility
18 Years to 62 Years · Female only
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Brooklyn, New York
Source: ClinicalTrials.gov public record
Updated Apr 1, 2026 · Synced Jun 26, 2026, 5:38 PM EDT
Terminated Phase 2 Interventional Results available

Supplemental Parenteral Nutrition in Pediatric Respiratory Failure

NCT01937884
View directory record Official record
Conditions
Acute Respiratory Failure With Hypoxia, Malnutrition
Interventions
Parenteral Nutrition
Drug
Lead sponsor
University of Arizona
Other
Eligibility
1 Month to 16 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Mar 2, 2021 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Phase 4 Interventional Results available

Vitamin D and Coronary Calcification Study

NCT00752102
View directory record Official record
Conditions
Chronic Kidney Disease, Vitamin D Deficiency, Coronary Calcification, Disorders of Calcium and Bone Metabolism
Interventions
Calcitriol (Rocaltrol®), Paricalcitol
Drug
Lead sponsor
Joslin Diabetes Center
Other
Eligibility
25 Years and older
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 7, 2017 · Synced Jun 26, 2026, 5:38 PM EDT
Recruiting Not applicable Interventional

Evaluation of the Clinical and Psychological Impact of Vitamin D Replacement in Adolescent Females at Risk for Polycystic Ovarian Syndrome (PCOS)

NCT04355572
View directory record Official record
Conditions
Polycystic Ovarian Syndrome in Adolescent Females, Vitamin D Deficiency
Interventions
Vitamin D 4000IU daily, Placebo
Drug
Lead sponsor
Yale University
Other
Eligibility
13 Years to 21 Years · Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 22, 2026 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

How Does Magnesium Status Influence Calcium Homeostasis?

NCT01593501
View directory record Official record
Conditions
Magnesium Deficiency, Calcium Metabolism Disorders
Interventions
vitamin D3
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
30 Years to 75 Years · Female only
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 31, 2016 · Synced Jun 26, 2026, 5:38 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Impact of Life-size Growth Charts on Understanding of Stunting

NCT04579328
View directory record Official record
Conditions
Stunting
Interventions
Exposure to Growth Mats
Behavioral
Lead sponsor
Tufts University
Other
Eligibility
18 Years and older
Enrollment
1,019 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 5, 2021 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Not applicable Interventional Results available

Ultraviolet Light And Vitamin D In Subjects With Fat Malabsorption Or After Gastric Bypass Surgery

NCT01910792
View directory record Official record
Conditions
Vitamin D Deficiency, Gastrointestinal Diseases
Interventions
Sperti Lamp
Device
Lead sponsor
Boston University
Other
Eligibility
18 Years to 64 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 10, 2017 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Hypovitaminosis D in Neurocritical Patients

NCT02881957
View directory record Official record
Conditions
Craniocerebral Trauma, Intracranial Aneurysm, Brain Neoplasms, Spinal Cord Injuries, Seizures, Meningitis, Stroke, Intracranial Hemorrhages, Critical Illness, Vitamin d Deficiency
Interventions
Cholecalciferol, Placebo
Drug · Other
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
274 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jun 14, 2022 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin D on Lipids

NCT00723385
View directory record Official record
Conditions
Hypercholesterolemia, Vitamin D Deficiency
Interventions
Vitamin D (1000 or 2000 IU/day), Placebo
Dietary Supplement · Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
130 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2012
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Apr 7, 2015 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Controlled Trial of Prenatal Vitamin D3 Supplementation to Prevent Vitamin D Deficiency in Mothers and Their Infants

NCT00610688
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Prenatal Vitamin, Cholecalciferol (Vitamin D3)
Drug
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
192 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2012
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 18, 2021 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Not applicable Interventional

Comparative Effectiveness of 7 Versus 21 Home-delivered Medically Tailored Meals to Improve Malnutrition Risk in Malnourished Patients With Heart Failure

NCT06142903
View directory record Official record
Conditions
Heart Failure, Malnutrition
Interventions
7 versus 21 medically tailored meals per week
Other
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years to 90 Years
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 19, 2025 · Synced Jun 26, 2026, 5:38 PM EDT
Not listed Phase 2 Interventional

Effects of Vitamin D on Inflammation in Liver Disease

NCT01754961
View directory record Official record
Conditions
Hepatitis C Infection, Vitamin D Deficiency
Interventions
Vitamin D, Placebo
Drug
Lead sponsor
Veterans Medical Research Foundation
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Dec 20, 2012 · Synced Jun 26, 2026, 5:38 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Evaluating Response to Vitamin D3 and K2 Supplementation in Healthcare Personnel

NCT07199829
View directory record Official record
Conditions
Hypovitaminosis D, Hypovitaminosis
Interventions
Vitamin Arm 1, Vitamin Arm 2, Vitamin Arm 3, Placebo
Dietary Supplement · Other
Lead sponsor
Madigan Army Medical Center
Federal
Eligibility
18 Years to 69 Years
Enrollment
96 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Sep 29, 2025 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

The Impact of Qualia Vitamin C+ on Blood Vitamin C Levels

NCT07285109
View directory record Official record
Conditions
Vitamin C Deficiency
Interventions
Qualia Vitamin C+, Placebo
Dietary Supplement
Lead sponsor
Qualia Life Sciences
Industry
Eligibility
25 Years and older
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Carlsbad, California
Source: ClinicalTrials.gov public record
Updated May 6, 2026 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Safety, Efficacy, and Feasibility of High-dose Cholecalciferol in Pediatric Patients With Cystic Fibrosis

NCT02613884
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Treatment
Drug
Lead sponsor
Johns Hopkins All Children's Hospital
Other
Eligibility
36 Months to 18 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
St. Petersburg, Florida
Source: ClinicalTrials.gov public record
Updated Feb 2, 2021 · Synced Jun 26, 2026, 5:38 PM EDT
Completed No phase listed Observational

Laparoscopic Revision of Jejunoileal Bypass to Gastric Bypass

NCT01040533
View directory record Official record
Conditions
Clinically Severe Obesity, Metabolic Complications After Jejunoileal Bypass, Nutritional Complications After Jejunoileal Bypass, Obesity Recidivism, Inadequate Initial Weight Loss, Intestinal Malabsorptive Syndrome, Protein Malnutrition
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 65 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
1
States / cities
Fresno, California
Source: ClinicalTrials.gov public record
Updated Dec 28, 2009 · Synced Jun 26, 2026, 5:38 PM EDT
Terminated Not applicable Interventional

Hypovitaminosis D and an Inadequate PTH Response in Chronic Liver Disease Patients

NCT00599352
View directory record Official record
Conditions
Chronic Liver Disease, Hypovitaminosis
Interventions
magnesium
Dietary Supplement
Lead sponsor
Rajib Bhattacharya, MD
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated May 29, 2013 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Culturally Appropriate Nutrition Communication for Mexican American Women

NCT04352530
View directory record Official record
Conditions
Lifestyle Risk Reduction, Nutrition Poor, Chronic Disease, Obesity, Cancer, Breast
Interventions
Health Communication
Other
Lead sponsor
University of California, Merced
Other
Eligibility
18 Years to 29 Years
Enrollment
881 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2022
U.S. locations
1
States / cities
Merced, California
Source: ClinicalTrials.gov public record
Updated May 8, 2023 · Synced Jun 26, 2026, 5:38 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Energy Status and Protein Intake As Prognostic Indicators of Rehabilitative Outcomes

NCT06734845
View directory record Official record
Conditions
Orthopedic, Osteo Arthritis Knee, Hip Osteoarthritis, Protein-Energy Malnutrition, Energy Malnutrition Protein
Interventions
Total Knee Arthroplasty, Total Joint Arthroplasty
Procedure
Lead sponsor
University of Connecticut
Other
Eligibility
50 Years to 70 Years
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Hartford, Connecticut
Source: ClinicalTrials.gov public record
Updated Dec 15, 2024 · Synced Jun 26, 2026, 5:38 PM EDT
Completed Not applicable Interventional

Teen and Young Adult Connections for Support From Multidisciplinary Professionals & Peers

NCT02987569
View directory record Official record
Conditions
Short Bowel Syndrome, Malabsorption, Malnutrition
Interventions
mConnect plus mobile connections to multidisciplinary professionals & peers, iPad use plus one mobile connections to multidisciplinary professionals & peers
Behavioral
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
13 Years to 30 Years
Enrollment
83 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Dec 1, 2020 · Synced Jun 26, 2026, 5:38 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 Jun 26, 2026, 5:38 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Treatment of Vitamin D Insufficiency

NCT00933244
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
High Dose Vitamin D3, Low Dose Vitamin D3, Placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
Up to 75 Years · Female only
Enrollment
230 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 9, 2015 · Synced Jun 26, 2026, 5:38 PM EDT