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Showing 1–24 of 266 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Vitamin A alone Clear all
Completed Not applicable Interventional

The Effect of Vitamin C on Wound Healing In Mandibular Fracture Patients

NCT03938584
View directory record Official record
Conditions
Vitamin C Deficiency, Smoking, Surgery, Surgery--Complications, Wound, Wound Complication, Wound Infection, Wound Dehiscence, Wound of Skin, Mandible Fracture, Mandible Open Fracture, Mandible Closed Fracture, Mandibular Fractures, Ascorbic Acid Deficiency, Oxidative Stress, Inflammation
Interventions
Vitamin C, Placebo
Dietary Supplement · Other
Lead sponsor
Hennepin Healthcare Research Institute
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 25, 2022 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Nitric Oxide Bioavailability in Chronic Obstructive Pulmonary Disease (COPD)

NCT01398943
View directory record Official record
Conditions
Pulmonary Disease, Chronic Obstructive
Interventions
Tetrahydrobiopterin (BH4), Antioxidant Cocktail
Drug · Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2015
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Dec 10, 2017 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Phase 4 Interventional

A Randomized Phase IV Control Trial of Single High Dose Oral Vitamin D3 in Pediatric Patients Undergoing HSCT

NCT03176849
View directory record Official record
Conditions
Vitamin D Deficiency, Stem Cell Transplant Complications, Pediatric Cancer, Blood Disorder, Pediatric Acute Myeloid Leukemia, Pediatric Acute Lymphoid Leukemia, Myelodysplastic Syndromes, Sickle Cell Anemia in Children, Aplastic Anemia, Thalassemia in Children
Interventions
Vitamin D3, Standard Vitamin D3 Supplementation
Dietary Supplement
Lead sponsor
Phoenix Children's Hospital
Other
Eligibility
1 Year to 25 Years
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Nov 16, 2020 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Effect of a Meal on Vitamin D Absorption

NCT01268176
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
50 Years to 69 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 12, 2013 · Synced Sep 10, 2026, 9:50 AM EDT
Completed No phase listed Observational Results available

Vitamin D to Improve Outcomes by Leveraging Early Treatment: Long-term Brain Outcomes in Vitamin D Deficient Patients

NCT03733418
View directory record Official record
Conditions
Cognitive Decline
Interventions
540,000 IU vitamin D3, Placebo
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
95 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
7
States / cities
Aurora, Colorado • Boston, Massachusetts • New York, New York + 3 more
Source: ClinicalTrials.gov public record
Updated Oct 20, 2024 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Vitamin D Supplementation and Physical Function in Older Adults

NCT01179503
View directory record Official record
Conditions
Physical Function, Vitamin D Insufficiency
Interventions
calcium, Vitamin D plus calcium
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
70 Years to 89 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 16, 2018 · Synced Sep 10, 2026, 9:50 AM EDT
Terminated Not applicable Interventional Results available

Adjunctive Transcranial Direct Current Stimulation

NCT02665988
View directory record Official record
Conditions
Chronic Pain, Psychiatric Disorders
Interventions
tDCS, Sham tDCS
Device
Lead sponsor
Baylor College of Medicine
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Apr 14, 2021 · Synced Sep 10, 2026, 9:50 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Standard Process Heart and Gut Health Study

NCT05795946
View directory record Official record
Conditions
Nutrition, Healthy
Interventions
Whole food-based B and D vitamins
Dietary Supplement
Lead sponsor
Standard Process Inc.
Industry
Eligibility
25 Years to 80 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Kannapolis, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 9, 2025 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Vitamin A Absorption From Cassava in Women

NCT01381276
View directory record Official record
Conditions
Vitamin A Deficiency
Interventions
Beta-Carotene bio-fortified cassava porridge without oil, Beta-Carotene bio-fortified cassava porridge with oil, White cassava porridge with retinyl palmitate reference dose
Other
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
18 Years to 45 Years · Female only
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Dec 11, 2011 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Effect of Vitamin D Supplementation on Bone Turnover Markers During PrEP in MSM

NCT02367599
View directory record Official record
Conditions
Patient Adherence
Interventions
Vitamin D Supplement
Drug
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older · Male only
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2018
U.S. locations
3
States / cities
Los Angeles, California • San Diego, California • Torrance, California
Source: ClinicalTrials.gov public record
Updated Jul 1, 2020 · Synced Sep 10, 2026, 9:50 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

A Clinical Study to Evaluate the Efficacy of Four Supplements on Improving Readiness for Intimacy

NCT05862519
View directory record Official record
Conditions
Libido, Intimacy, Gastrointestinal Issues
Interventions
Reset, Stay Ready Fiber, Libido, Testosterone supplement
Dietary Supplement
Lead sponsor
906 CMVI Holdings
Industry
Eligibility
18 Years to 44 Years · Male only
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated May 16, 2023 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Phase 2 Interventional

Immune Effects of Vitamin D in Hemodialysis Patients

NCT00686751
View directory record Official record
Conditions
End Stage Renal Disease, Hemodialysis, Inflammatory Response, Cardiovascular Disease
Interventions
paricalcitol
Drug
Lead sponsor
Renal Research Institute
Other
Eligibility
18 Years to 75 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2007
U.S. locations
3
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 12, 2009 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Not applicable Interventional

Combined Estrogen Blockade of the Breast With Exemestane and Raloxifene in Postmenopausal Women With a History of Breast Cancer Who Have No Clinical Evidence of Disease

NCT00200174
View directory record Official record
Conditions
Breast Cancer
Interventions
Raloxifene followed by combination therapy, Exemestane followed by combination therapy
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2008
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 4, 2023 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Phase 1 Interventional

Drug-drug Interaction Study of Tivantinib (ARQ 197) With Omeprazole, S-warfarin, Caffeine, Midazolam, and Digoxin in Cancer Subjects

NCT01517399
View directory record Official record
Conditions
Solid Tumors
Interventions
tivantinib, omeprazole, s-warfarin, caffeine, vitamin K, digoxin, midazolam
Drug · Dietary Supplement
Lead sponsor
Daiichi Sankyo
Industry
Eligibility
18 Years and older
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Feb 11, 2019 · Synced Sep 10, 2026, 9:50 AM EDT
Enrolling by invitation Not applicable Interventional

Virtual Lifestyle Intervention for Weight Management and Cardiovascular Heal

NCT07572721
View directory record Official record
Conditions
Cardiovascular Risk Factor
Interventions
Multicomponent Virtual Lifestyle Intervention
Behavioral
Lead sponsor
Truemedicine Inc
Other
Eligibility
30 Years to 60 Years
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated May 6, 2026 · Synced Sep 10, 2026, 9:50 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

IV Administration of ChromaDex's Niagen® as Compared to NAD+

NCT06382688
View directory record Official record
Conditions
Healthy Aging
Interventions
NAD+ (nicotinamide adenine dinucleotide) IV, Niagen® (nicotinamide riboside) IV, Niagen® (nicotinamide riboside) oral, Placebo
Dietary Supplement · Other
Lead sponsor
Nutraceuticals Research Institute
Other
Eligibility
40 Years and older
Enrollment
53 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Franklin, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 23, 2024 · Synced Sep 10, 2026, 9:50 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Nicotinamide Riboside, Vit B3 Analogue, and Brain Energy Metabolism

NCT07649161
View directory record Official record
Conditions
Healthy Adult
Interventions
Niagen®
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 16, 2026 · Synced Sep 10, 2026, 9:50 AM EDT
Recruiting Phase 1 Interventional

A Study of Nicotinamide With Oral Tetrahydrouridine and Decitabine to Treat High Risk Sickle Cell Disease

NCT04055818
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
Nicotinamide
Drug
Lead sponsor
EpiDestiny, Inc.
Industry
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2027
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 24, 2025 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Phase 1 Interventional

Pharmacokinetic Study to Evaluate the Effect of a Single Dose of Guselkumab (CNTO 1959) on CYP 450 Enzyme Activities After Subcutaneous Administration in Participants With Psoriasis

NCT02397382
View directory record Official record
Conditions
Psoriasis
Interventions
Guselkumab, Midazolam, Warfarin, Omeprazole, Dextromethorphan, Caffeine
Drug
Lead sponsor
Janssen Research & Development, LLC
Industry
Eligibility
18 Years to 65 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
8
States / cities
Anniston, Alabama • North Hollywood, California • Orlando, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Sep 19, 2017 · Synced Sep 10, 2026, 9:50 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Prospective Study of Topical Vitamin C (THDA) Versus Topical Vitamin C (THDA) With Acetyl Zingerone

NCT05779280
View directory record Official record
Conditions
Wrinkle, Skin Pigmentation
Interventions
THDA + Acetyl Zingerone Topical Product, THDA
Other
Lead sponsor
Integrative Skin Science and Research
Industry
Eligibility
30 Years to 65 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Jul 24, 2023 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Nutrition and Body Composition in Acute Lymphoblastic Leukemia

NCT01317940
View directory record Official record
Conditions
Precursor Cell Lymphoblastic Leukemia-Lymphoma, Vitamin D Deficiency
Interventions
Vitamin D and Calcium Citrate
Dietary Supplement
Lead sponsor
Children's Hospital Los Angeles
Other
Eligibility
10 Years to 29 Years
Enrollment
76 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2016
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jul 7, 2020 · Synced Sep 10, 2026, 9:50 AM EDT
Terminated Phase 1Phase 2 Interventional

Arsenic Trioxide With or Without Tretinoin in Treating Patients With Hematologic Cancer That Has Not Responded to Previous Therapy

NCT00006220
View directory record Official record
Conditions
Leukemia, Lymphoma, Multiple Myeloma and Plasma Cell Neoplasm, Myelodysplastic Syndromes
Interventions
arsenic trioxide, tretinoin
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
15 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2002
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Feb 5, 2013 · Synced Sep 10, 2026, 9:50 AM EDT
Completed Not applicable Interventional

Prevention of Malnutrition in Children With Sickle Cell Disease

NCT06397118
View directory record Official record
Conditions
Sickle Cell Disease, Malnutrition
Interventions
Maternal Nutrition Education, Standard Care
Behavioral
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
6 Months to 18 Months
Enrollment
146 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jun 16, 2026 · Synced Sep 10, 2026, 9:50 AM EDT
Active, not recruiting Phase 2 Interventional

MT2013-31: Allo HCT for Metabolic Disorders and Severe Osteopetrosis

NCT02171104
View directory record Official record
Conditions
Mucopolysaccharidosis Disorders, Hurler Syndrome, Hunter Syndrome, Maroteaux Lamy Syndrome, Sly Syndrome, Alpha-Mannosidosis, Fucosidosis, Aspartylglucosaminuria, Glycoprotein Metabolic Disorders, Sphingolipidoses, Recessive Leukodystrophies, Globoid Cell Leukodystrophy, Metachromatic Leukodystrophy, Niemann-Pick B, Niemann-Pick C Subtype 2, Sphingomyelin Deficiency, Peroxisomal Disorders, Adrenoleukodystrophy With Cerebral Involvement, Zellweger Syndrome, Neonatal Adrenoleukodystrophy, Infantile Refsum Disease, Acyl-CoA Oxidase Deficiency, D-Bifunctional Enzyme Deficiency, Multifunctional Enzyme Deficiency, Alpha-methylacyl-CoA Racmase Deficiency, Mitochondrial Neurogastrointestingal Encephalopathy, Severe Osteopetrosis, Hereditary Leukoencephalopathy With Axonal Spheroids (HDLS; CSF1R Mutation), Inherited Metabolic Disorders
Interventions
Stem Cell Transplantation, IMD Preparative Regimen, Osteopetrosis Only Preparative Regimen, Osteopetrosis Haploidentical Only Preparative Regimen, cALD SR-A (Standard-Risk, Regimen A), cALD SR-B (Standard-Risk, Regimen B), cALD HR-D (High-Risk, Regimen C), cALD HR-D (High-Risk, Regimen D)
Biological · Drug
Lead sponsor
Masonic Cancer Center, University of Minnesota
Other
Eligibility
Up to 55 Years
Enrollment
149 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2029
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 6, 2026 · Synced Sep 10, 2026, 9:50 AM EDT