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Showing 1–24 of 44 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: B Vitamin Deficiency Clear all
Completed Not applicable Interventional

Vitamin B Therapy for Hyperlactatemia

NCT00031057
View directory record Official record
Conditions
HIV Infections
Interventions
Thiamine hydrochloride, Riboflavin
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
13 Years and older
Enrollment
225 participants
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
3
States / cities
New York, New York • Chapel Hill, North Carolina • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 27, 2011 · Synced Sep 11, 2026, 8:41 AM EDT
Recruiting Early Phase 1 Interventional

Type 2 Diabetes and Blood Brain Barrier Improvement

NCT06322212
View directory record Official record
Conditions
Type2diabetes
Interventions
Thiamine, Placebo
Dietary Supplement · Other
Lead sponsor
University of California, Los Angeles
Other
Eligibility
40 Years to 65 Years
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 12, 2026 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Not applicable Interventional Results available

Impact of Vitamin B12 Replacement on Epogen Dosing and Improvement of Quality of Life in Hemodialysis Patients

NCT01876732
View directory record Official record
Conditions
Vitamin B12 Deficiency
Interventions
Vitamin B12
Drug
Lead sponsor
Northwell Health
Other
Eligibility
18 Years to 90 Years
Enrollment
132 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Staten Island, New York
Source: ClinicalTrials.gov public record
Updated Sep 7, 2014 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Phase 1 Interventional

Effect of S-adenosylmethionine (SAMe) on Blood Levels of Homocysteine

NCT00473200
View directory record Official record
Conditions
Hyperhomocysteinemia
Interventions
S-adenosylmethionine
Dietary Supplement
Lead sponsor
Baylor Research Institute
Other
Eligibility
18 Years and older
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Mar 13, 2018 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Not applicable Interventional

Correlation Between Vitamin D Status and Bone Mineral Density in Patients With Hemophilia

NCT01090206
View directory record Official record
Conditions
Hemophilia A, Hemophilia B, Vitamin D Deficiency
Interventions
Vitamin D and calcium
Dietary Supplement
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
2 Years to 21 Years · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 28, 2016 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Vitamin B6 Effects for Women Taking Birth Control Pills

NCT01128244
View directory record Official record
Conditions
Vitamin B6 Deficiency
Interventions
Vitamin B6, Infusion of labeled serine, methionine and leucine
Dietary Supplement · Procedure
Lead sponsor
University of Florida
Other
Eligibility
20 Years to 40 Years · Female only
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2014
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Feb 6, 2017 · Synced Sep 11, 2026, 8:41 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Salt-FA to Increase Folate Levels

NCT06174883
View directory record Official record
Conditions
Neural Tube Defects, Folic Acid Deficiency, Spina Bifida, Anencephaly-Spina Bifida
Interventions
Folic acid fortified iodized salt
Dietary Supplement
Lead sponsor
Hydrocephalus and Neuroscience Institute
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Dec 18, 2023 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

An Exploratory Investigation of a B12 Vitamin to Increase Energy and Focus

NCT05517005
View directory record Official record
Conditions
B12 Deficiency Vitamin, Energy Supply; Deficiency, Mood
Interventions
Hype Bites Supplement
Dietary Supplement
Lead sponsor
Sourse
Industry
Eligibility
24 Years to 65 Years
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Aug 22, 2024 · Synced Sep 11, 2026, 8:41 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Using Iodized Salt to Improve Serum Folate, B12 and Iron Levels

NCT06904612
View directory record Official record
Conditions
Neural Tube Defects, Folic Acid Deficiency, Spina Bifida, Anencephaly-Spina Bifida, B12 Deficiency Vitamin, Anemia, Iron Deficiency Anaemia Due to Dietary Causes
Interventions
Micronutrient fortified iodized salt
Dietary Supplement
Lead sponsor
Hydrocephalus and Neuroscience Institute
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Jul 13, 2025 · Synced Sep 11, 2026, 8:41 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Folic Acid Salt Study (FISFA Zambia)

NCT06734611
View directory record Official record
Conditions
Folate Deficiency, Neural Tube Defects
Interventions
Fortified Iodized Salt with Folic Acid (FISFA)
Dietary Supplement
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
250 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jun 28, 2026 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

The Effect of Oral Vitamin D Versus Narrow-Band UV-B Exposure on the Lipid Profile

NCT01688102
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Oral Vitamin D3, Ultraviolet Light
Dietary Supplement · Radiation
Lead sponsor
Rockefeller University
Other
Eligibility
18 Years to 70 Years
Enrollment
118 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 5, 2017 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Not applicable Interventional Results available

Cholecalciferol in Newly Diagnosed Non-Hodgkin Lymphoma or Chronic Lymphocytic Leukemia With Vitamin D Deficiency

NCT02553447
View directory record Official record
Conditions
Chronic Lymphocytic Leukemia, Non-Hodgkin Lymphoma, Untreated Chronic Lymphocytic Leukemia, Vitamin D Deficiency
Interventions
Cholecalciferol, Laboratory Biomarker Analysis
Dietary Supplement · Other
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
197 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2025
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Apr 20, 2026 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Cobalamin Absorption From Fortified Food

NCT01399164
View directory record Official record
Conditions
Vitamin B-12 Deficiency, Achlorhydria
Interventions
14C-B12 fortified bread
Other
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
60 Years and older
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Oct 21, 2013 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Phase 4 Interventional Results available

A Study of Serum Folate Levels in Patients Treated With Olaparib

NCT04024254
View directory record Official record
Conditions
Ovarian Cancer, Breast Cancer, Folic Acid Deficiency
Interventions
Folic Acid Tablet
Drug
Lead sponsor
Rush University Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2025
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 3, 2026 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Phase 2 Interventional Results available

High Dose Intravenous Thiamine for the Prevention of Delirium in Allogeneic Hematopoietic Stem Cell Transplantation

NCT03263442
View directory record Official record
Conditions
Hematopoietic Stem Cell Transplantation, Delirium, Thiamine Deficiency
Interventions
Thiamine, Normal saline
Drug
Lead sponsor
UNC Lineberger Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
66 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 18, 2021 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Evaluating the Effect of SOLIUS UV Light Source in Improving Vitamin D Status

NCT04780776
View directory record Official record
Conditions
Vitamin D Deficiency, Vitamin D Insufficiency
Interventions
UVB treatment, Sham comparator
Device
Lead sponsor
Boston University
Other
Eligibility
22 Years and older
Enrollment
69 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 21, 2024 · Synced Sep 11, 2026, 8:41 AM EDT
Completed No phase listed Observational

Spontaneous Coronary Artery Dissection (SCAD) and Autoimmunity

NCT03941184
View directory record Official record
Conditions
SCAD, Addison Disease, Ankylosing Spondylitis, Antiphospholipid Antibody Syndrome, Celiac Disease, Crohn Disease, Dermatomyositis, Polymyositis, Guillain-Barre Syndrome, Hepatitis, Autoimmune, Graves Disease, Hashimoto Thyroiditis, Multiple Sclerosis, Myasthenia Gravis, Pernicious Anemia, Polymyalgia Rheumatica, Primary Biliary Cirrhosis, Psoriasis, Rheumatoid Arthritis, Systemic Sclerosis, Sjögren Syndrome, Systemic Lupus Erythematosus, Takayasu Arteritis, Type 1 Diabetes Mellitus, Ulcerative Colitis, Uveitis, Vasculitis, Vitiligo, Raynaud
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 110 Years
Enrollment
114 participants
Timeline
1995 – 2020
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Nov 22, 2020 · Synced Sep 11, 2026, 8:41 AM EDT
Completed No phase listed Observational

Prevalence of Liver Disease in Patients Dependent on Parenteral Nutrition

NCT05011370
View directory record Official record
Conditions
Intestinal Failure-associated Liver Disease
Interventions
Not listed
Lead sponsor
Protara Therapeutics
Industry
Eligibility
12 Years to 80 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
10
States / cities
Los Angeles, California • Kissimmee, Florida • Chicago, Illinois + 7 more
Source: ClinicalTrials.gov public record
Updated Oct 2, 2023 · Synced Sep 11, 2026, 8:41 AM EDT
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 Sep 9, 2026 · Synced Sep 11, 2026, 8:41 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Maternal Risk Factors for Autism Spectrum Disorders: A Case-Control Approach

NCT05453708
View directory record Official record
Conditions
Autism, Autism Spectrum Disorder, Autistic Disorder, Pregnancy Related, Diet, Healthy, Diet; Deficiency, Folate Deficiency, Folic Acid Deficiency, Folic Acid Overdose
Interventions
Survey
Other
Lead sponsor
Walden University
Other
Eligibility
18 Years and older · Female only
Enrollment
239 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 19, 2023 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Not applicable Interventional

Randomized Study of Folic Acid Therapy for Hyperhomocysteinemia in Patients With End Stage Renal Disease Receiving Hemodialysis

NCT00004495
View directory record Official record
Conditions
End Stage Renal Disease, Hyperhomocysteinemia
Interventions
cyanocobalamin, folic acid, pyridoxine
Drug
Lead sponsor
Georgetown University
Other
Eligibility
21 Years to 89 Years
Enrollment
84 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2000
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Mar 24, 2015 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Consumption of Post-harvest UV-B Treated Mushrooms on Vitamin D Status of Healthy Adults

NCT01443897
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
1,000 IU vitamin D2, placebo capsule, mushrooms, UVB-treated mushrooms, 400 IU vitamin D2, UVB-treated mushrooms, 1,000 IU vitamin D2
Dietary Supplement · Other
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
20 Years to 59 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Sep 29, 2011 · Synced Sep 11, 2026, 8:41 AM EDT
Recruiting Phase 2Phase 3 Interventional

Study of Choline Chloride for Injection in Adolescent and Adult Patients With Intestinal Failure Receiving Long Term Parenteral Support

NCT06910943
View directory record Official record
Conditions
Choline Deficiency, Liver Injury
Interventions
Choline Chloride for Injection, Placebo
Drug
Lead sponsor
Protara Therapeutics
Industry
Eligibility
12 Years and older
Enrollment
129 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2029
U.S. locations
8
States / cities
Aurora, Colorado • Miami Lakes, Florida • Chicago, Illinois + 5 more
Source: ClinicalTrials.gov public record
Updated Aug 23, 2026 · Synced Sep 11, 2026, 8:41 AM EDT
Completed Not applicable Interventional Results available

Treatment of Vitamin D Deficiency in Intestinal Rehabilitation Clinic Patients With a Portable Ultraviolet B Lamp

NCT01930539
View directory record Official record
Conditions
Vitamin D Deficiency, Short Bowel Syndrome
Interventions
Ultraviolet B lamp
Device
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Oct 3, 2023 · Synced Sep 11, 2026, 8:41 AM EDT