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ClinicalTrials.gov public records Last synced Oct 12, 2026, 7:55 PM EDT

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Showing 289–312 of 374 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Dietary Supplement/Vitamins Clear all
Recruiting Not applicable Interventional

Anti-inflammatory Activities of Vitamin C Supplementation on the Gut Barrier Function in Adults With Obesity

NCT07151105
View directory record Official record
Conditions
Adequate Vitamin C Status, Inadequate Vitamin C Status
Interventions
Vitamin C Supplement + Low Vitamin C Diet, Placebo + Low Vitamin C Diet
Dietary Supplement
Lead sponsor
Ohio State University
Other
Eligibility
18 Years to 50 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 1, 2026 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Clinical Trial to Evaluate the Effects of a Supplement on Supporting Signs of a Healthy Metabolism

NCT07765407
View directory record Official record
Conditions
Poor Energy Levels, Poor Metabolism, Difficulty With Weight Management, Bloating
Interventions
Love Wellness Energize
Dietary Supplement
Lead sponsor
Love Wellness
Industry
Eligibility
25 Years to 45 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Las Vegas, Nevada
Source: ClinicalTrials.gov public record
Updated Aug 14, 2026 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Examine the Effects of a Daily Supplement on Common Symptoms of Perimenopause and Menopause

NCT06018740
View directory record Official record
Conditions
Menopause, Perimenopause
Interventions
Daily Balance Gummy
Dietary Supplement
Lead sponsor
Hologram Sciences
Industry
Eligibility
40 Years to 65 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Feb 29, 2024 · Synced Oct 12, 2026, 7:55 PM EDT
Recruiting Not applicable Interventional

B6 Administration for Levetiracetam-Associated Neurobehavioral Changes and Epilepsy

NCT07271966
View directory record Official record
Conditions
Brain Tumor Related Epilepsy (BTRE)
Interventions
Vitamin B6 100 MG
Dietary Supplement
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 29, 2026 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Calcium, Vitamin D, Magnesium, and Zinc Absorption in Children

NCT00868738
View directory record Official record
Conditions
Mineral Absorption
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
Baylor College of Medicine
Other
Eligibility
4 Years to 8 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Nov 2, 2011 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Optimization of Blood Levels of 25(OH)-Vitamin D in African Americans

NCT04939792
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D, Placebo, Vitamin D + L-cysteine, L-cysteine
Drug
Lead sponsor
Louisiana State University Health Sciences Center Shreveport
Other
Eligibility
18 Years to 65 Years
Enrollment
165 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Shreveport, Louisiana
Source: ClinicalTrials.gov public record
Updated Jun 8, 2023 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Calcium and Vitamin D Supplementation During Marine Corps Training

NCT02636348
View directory record Official record
Conditions
Nutrition Status, Bone Health
Interventions
Calcium/Vitamin D, Placebo
Dietary Supplement
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
17 Years and older
Enrollment
380 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Parris Island, South Carolina
Source: ClinicalTrials.gov public record
Updated Oct 28, 2016 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Nutritional Outcomes After Vitamin A Supplementation in Subjects With SCD

NCT03632876
View directory record Official record
Conditions
Sickle Cell Anemia in Children, Vitamin A Deficiency in Children
Interventions
retinyl palmitate
Dietary Supplement
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
9 Years and older
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 16, 2018 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assessment of a Pre-Workout Dietary Supplement

NCT02952014
View directory record Official record
Conditions
Dietary Modification
Interventions
C4 Extreme, C4 Extreme (without Advantra Z, Placebo
Dietary Supplement
Lead sponsor
Texas A&M University
Other
Eligibility
18 Years to 40 Years
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Nov 2, 2016 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Safety Evaluation of a Diet and Nutritional Supplementation Program- Purify 2.0

NCT03685552
View directory record Official record
Conditions
Gastrointestinal Symptoms
Interventions
Prog: Purify-2
Other
Lead sponsor
Nature's Sunshine Products, Inc.
Industry
Eligibility
18 Years to 69 Years
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Lehi, Utah
Source: ClinicalTrials.gov public record
Updated Sep 26, 2018 · Synced Oct 12, 2026, 7:55 PM EDT
Active, not recruiting Phase 2 Interventional Accepts healthy volunteers

Nicotinamide Riboside for Treating Elevated Systolic Blood Pressure and Arterial Stiffness in Middle-aged and Older Adults

NCT03821623
View directory record Official record
Conditions
Hypertension, Aging
Interventions
Nicotinamide riboside, Placebo
Drug · Other
Lead sponsor
Douglas Seals
Other
Eligibility
50 Years and older
Enrollment
118 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2027
U.S. locations
1
States / cities
Boulder, Colorado
Source: ClinicalTrials.gov public record
Updated Oct 2, 2026 · Synced Oct 12, 2026, 7:55 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 23, 2024 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D as a Supplement Against Falls in Elderly Study

NCT01827345
View directory record Official record
Conditions
Vitamin D Deficiency (10 ng/mL to 30 ng/mL)
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
70 Years and older
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2016
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Dec 26, 2016 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Nitroglycerin Ointment for Preventing Bone Loss in Postmenopausal Women

NCT00043719
View directory record Official record
Conditions
Osteoporosis, Osteopenia
Interventions
Nitroglycerin ointment, Calcium supplement with vitamin D
Drug
Lead sponsor
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
NIH
Eligibility
40 Years to 65 Years · Female only
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2002 – 2007
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated Feb 2, 2009 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Epithelial Healing and Visual Outcomes Using Omega-3 Therapy Before and After Photorefractive Keratectomy (PRK) Surgery

NCT01059019
View directory record Official record
Conditions
Refractive Error
Interventions
Omega-3 Fatty Acid Supplements
Dietary Supplement
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years to 28 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Jun 21, 2013 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional

Correlative Analysis of the Genomics of Vitamin D and Omega-3 Fatty Acid Intake in Prostate Cancer

NCT03290417
View directory record Official record
Conditions
Prostate Cancer
Interventions
Vitamin D, Omega-3, Turmeric
Dietary Supplement
Lead sponsor
Case Comprehensive Cancer Center
Other
Eligibility
Male only
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 18, 2020 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effectiveness of a Vitamin Mineral Supplement

NCT00153764
View directory record Official record
Conditions
Healthy
Interventions
Cooper Complete One-A-Day Vitamin Supplement
Drug
Lead sponsor
The Cooper Institute
Other
Eligibility
30 Years to 70 Years
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2006
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Aug 2, 2012 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Single Group Study to Evaluate the Effects of a Myo-Inositol and D-Chiro Inositol Supplement on Symptoms Associated With Polycystic Ovary Syndrome and Hormone Imbalance

NCT06158932
View directory record Official record
Conditions
Polycystic Ovary Syndrome, Hormone Imbalance
Interventions
Optify Myo Inositol and D-Chiro Inositol Plus Folate and Vitamin D supplement
Dietary Supplement
Lead sponsor
Optify
Other
Eligibility
18 Years to 55 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Apr 3, 2024 · Synced Oct 12, 2026, 7:55 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 18, 2017 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional

Diabetes Visual Function Supplement Study

NCT01646047
View directory record Official record
Conditions
Diabetes Mellitus - Type 1, Diabetes Mellitus - Type 2, Non-proliferative Diabetic Retinopathy
Interventions
multi-component nutritional supplement capsules, multi-component dietary supplement
Dietary Supplement
Lead sponsor
ZeaVision, LLC
Industry
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Jan 22, 2015 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional

Key Nutrients and Mental Health

NCT03336125
View directory record Official record
Conditions
Mental Health Impairment
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
University of Bergen
Other
Eligibility
18 Years and older · Male only
Enrollment
86 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Mauston, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jun 28, 2019 · Synced Oct 12, 2026, 7:55 PM EDT
Withdrawn Phase 2 Interventional

Evaluation of a Compliance Marker in Prescription Opioid Abusers With Chronic Pain

NCT02276989
View directory record Official record
Conditions
Compliance, Chronic Pain
Interventions
acetazolamide, Quinine, Riboflavin
Drug
Lead sponsor
Georgetown University
Other
Eligibility
18 Years to 50 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Feb 10, 2017 · Synced Oct 12, 2026, 7:55 PM EDT
Completed Not applicable Interventional

Effects of Exercise in People With Tetraplegia

NCT01202019
View directory record Official record
Conditions
Spinal Cord Injury, Tetraplegia
Interventions
Circuit Resistance Training (CRT)
Other
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 55 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jul 22, 2014 · Synced Oct 12, 2026, 7:55 PM EDT
Active, not recruiting Not applicable Interventional

ViDES Trial (Vitamin D Extra Supplementation)

NCT05459298
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Placebo, 800 IU/day vitamin D supplementation with feedings in the first 28 days after birth, Usual Care
Dietary Supplement · Other
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
24 Hours to 96 Hours
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Oct 12, 2026, 7:55 PM EDT