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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Vitamin A supplement Clear all
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 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Chronic Obstructive Pulmonary Disease Fish Oil Pilot Trial

NCT00835289
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease
Interventions
n-3 polyunsaturated fatty acids, Placebo
Dietary Supplement · Other
Lead sponsor
Columbia University
Other
Eligibility
40 Years and older
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2013
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 16, 2020 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of a Multi-vitamin Supplement in Adult Females

NCT03828097
View directory record Official record
Conditions
Health, Subjective
Interventions
Experimental supplement, Placebo
Dietary Supplement
Lead sponsor
Auburn University
Other
Eligibility
21 Years to 40 Years · Female only
Enrollment
94 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Auburn, Alabama
Source: ClinicalTrials.gov public record
Updated Sep 27, 2020 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Echinacea, Propolis and Vitamin C for URI Prevention in Preschoolers

NCT00231218
View directory record Official record
Conditions
Common Cold, Gastroenteritis
Interventions
dietary supplement--echinacea, propolis, and vitamin c
Drug
Lead sponsor
The Cleveland Clinic
Other
Eligibility
3 Years to 6 Years
Enrollment
104 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 13, 2006 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin D on 25-hydroxyvitamin D Levels and Physical Function

NCT02293187
View directory record Official record
Conditions
Vitamin D Deficiency, Sarcopenia
Interventions
vitamin D3, Placebo
Dietary Supplement · Other
Lead sponsor
Tufts University
Other
Eligibility
60 Years to 85 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 20, 2019 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Phase 4 Interventional Results available

Novel Combination Therapy for Osteoporosis in Men

NCT03994172
View directory record Official record
Conditions
Male Osteoporosis
Interventions
Teriparatide or human parathyroid hormone (PTH) 1-34, Cinacalcet, placebo tablet, Calcium citrate tablet, Vitamin D3
Drug · Dietary Supplement
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
60 Years to 85 Years · Male only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Sep 2, 2026 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Phase 2 Interventional Results available

Safety and Efficacy of Alendronate (Fosamax) in Children With Osteoporosis

NCT00259857
View directory record Official record
Conditions
Osteoporosis
Interventions
Alendronate
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
5 Years to 15 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2009
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jan 18, 2011 · Synced Sep 28, 2026, 9:26 PM 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 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Consumption of 4D Dietary Supplement on Perceptual-Cognitive and Visual-Motor Performance

NCT04988919
View directory record Official record
Conditions
Dietary Supplementation
Interventions
4D, placebo
Dietary Supplement
Lead sponsor
University of Central Florida
Other
Eligibility
18 Years to 40 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Oct 7, 2021 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of a Female Hormone Balance Supplement on Premenstrual Syndrome Symptoms

NCT07018479
View directory record Official record
Conditions
Premenstrual Syndrome
Interventions
FemmeBalance Supplement Group
Dietary Supplement
Lead sponsor
VINABAS FORMULATIONS SL
Industry
Eligibility
18 Years to 40 Years · Female only
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Las Vegas, Nevada
Source: ClinicalTrials.gov public record
Updated Jun 11, 2025 · Synced Sep 28, 2026, 9:26 PM EDT
Terminated Not applicable Interventional

Vitamin D Supplement in Preventing Colon Cancer in African Americans With Colon Polyps

NCT00870961
View directory record Official record
Conditions
Colorectal Cancer, Precancerous Condition
Interventions
cholecalciferol, placebo
Dietary Supplement · Other
Lead sponsor
Northwestern University
Other
Eligibility
50 Years and older
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
2
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 15, 2013 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Phase 2 Interventional Results available

Study of Pralatrexate to Treat Participants With Relapsed or Refractory B-cell Non-Hodgkin's Lymphoma

NCT00998946
View directory record Official record
Conditions
Lymphoma, B-Cell
Interventions
Pralatrexate, Vitamin B12, Folic Acid
Drug · Dietary Supplement
Lead sponsor
Spectrum Pharmaceuticals, Inc
Industry
Eligibility
18 Years and older
Enrollment
29 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
11
States / cities
Beverly Hills, California • Post Falls, Idaho • Chicago, Illinois + 8 more
Source: ClinicalTrials.gov public record
Updated Nov 4, 2021 · Synced Sep 28, 2026, 9:26 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

A Clinical Trial to Examine the Efficacy of a Supplement to Support Healthy Hair and Skin

NCT06579742
View directory record Official record
Conditions
Hair Thinning, Hair Loss
Interventions
Live Conscious Beyond Collagen, Placebo
Dietary Supplement
Lead sponsor
Scale Media Inc
Industry
Eligibility
40 Years and older
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Aug 29, 2024 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Efficacy of Vitamin D in Colorectal Cancer Chemoprevention

NCT01574027
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Vitamin D3 (cholecalciferol), Placebo
Drug
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
50 Years and older
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2011
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 9, 2012 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional

Efficacy of Vitamin D Supplementation in Obese Children

NCT02956408
View directory record Official record
Conditions
Obesity, Pediatric, Obesity, Childhood, Obesity, Morbid, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Columbia University
Other
Eligibility
5 Years to 11 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 4, 2020 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional

Dietary Supplementation in Heart Failure

NCT03980574
View directory record Official record
Conditions
Heart Failure
Interventions
R Drink
Dietary Supplement
Lead sponsor
Ohio State University
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 21, 2021 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Efficacy of a Once Daily Calcium and Vitamin D Fortified Food Product to Improve Bone Microarchitecture

NCT02375503
View directory record Official record
Conditions
Bone Alteration, Dietary Modification
Interventions
Calcium/Vitamin D, Placebo
Dietary Supplement
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
17 Years to 42 Years
Enrollment
175 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated May 14, 2017 · Synced Sep 28, 2026, 9:26 PM EDT
Terminated Not applicable Interventional Results available

Study of Adults With Low Growth Hormone Who Survived Childhood Cancer Where Treatment Caused Low Bone Density

NCT00145704
View directory record Official record
Conditions
Osteopenia
Interventions
bisphosphonate therapy (risedronate), Vitamin D supplement, Calcium
Drug · Dietary Supplement
Lead sponsor
State University of New York - Upstate Medical University
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2008
U.S. locations
1
States / cities
Syracuse, New York
Source: ClinicalTrials.gov public record
Updated Apr 7, 2013 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

An Exploratory Investigation of a Supplement to Promote Cognitive Health Benefits

NCT05523115
View directory record Official record
Conditions
Anxiety, Stress, Memory Deficits, Cortisol Overproduction
Interventions
Heights Smart Supplement
Dietary Supplement
Lead sponsor
Heights
Industry
Eligibility
21 Years to 70 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Nov 7, 2022 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Establishing the Vitamin D Requirements During Lactation

NCT00412074
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
400 IU Vitamin D3 (cholecalciferol), 2400 IU Vitamin D3 (cholecalciferol), 6400 IU Vitamin D3 (cholecalciferol)
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
460 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2012
U.S. locations
2
States / cities
Rochester, New York • Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 3, 2018 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

EpiCor Clinical Study on Rapid Immune Modulating Effects

NCT05819424
View directory record Official record
Conditions
Immune Surveillance
Interventions
Yeast Fermentate (EpiCor)
Dietary Supplement
Lead sponsor
Cargill
Industry
Eligibility
18 Years to 60 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Klamath Falls, Oregon
Source: ClinicalTrials.gov public record
Updated Jan 24, 2024 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of a Nutritional Supplement on Metabolic Health

NCT02239198
View directory record Official record
Conditions
Cardiovascular Disease Prevention
Interventions
Nutrition bar
Other
Lead sponsor
UCSF Benioff Children's Hospital Oakland
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Oakland, California
Source: ClinicalTrials.gov public record
Updated Apr 17, 2017 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Assessment of Endogenous Oxalate Synthesis

NCT05229952
View directory record Official record
Conditions
Healthy, Kidney Stone, Obesity
Interventions
Low-oxalate controlled diet, Primed, continuous intravenous infusion of 13C2-oxalate
Dietary Supplement · Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 75 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated May 12, 2025 · Synced Sep 28, 2026, 9:26 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Lactation Fortification Study

NCT01747668
View directory record Official record
Conditions
Lactation
Interventions
Similac Prenatal Vitamin soft-gel capsule, Placebo (soybean oil and dl-alpha-tocopheryl acetate)
Dietary Supplement
Lead sponsor
Abbott Nutrition
Industry
Eligibility
18 Years and older · Female only
Enrollment
89 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
6
States / cities
Indianapolis, Indiana • Dayton, Ohio • Kettering, Ohio + 3 more
Source: ClinicalTrials.gov public record
Updated May 30, 2013 · Synced Sep 28, 2026, 9:26 PM EDT