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Showing 1–24 of 373 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Dietary Supplement/Vitamins Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Supplement Study for Adolescents

NCT00909454
View directory record Official record
Conditions
Vitamin D Deficiency, Overweight, Obesity
Interventions
2000 IU Vitamin D3 daily supplement, 400 IU Vitamin D3 supplement
Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
14 Years to 19 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Oct 16, 2011 · Synced Sep 22, 2026, 10:08 AM EDT
Completed Not applicable Interventional

The Effects of Perioperative Nutritional Optimization on Blood Markers

NCT04464161
View directory record Official record
Conditions
Intervertebral Disc Disorders With Radiculopathy, Lumbar Region
Interventions
Ensure
Dietary Supplement
Lead sponsor
NYU Langone Health
Other
Eligibility
55 Years to 100 Years
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 21, 2022 · Synced Sep 22, 2026, 10:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assessing the Safety and Efficacy of FSD-F2R6-A-CP in Volunteers in an Induced State of Alcohol Intoxication

NCT06505239
View directory record Official record
Conditions
Acute Alcohol Intoxication
Interventions
FSD-F2R6-A-CP, Placebo
Dietary Supplement
Lead sponsor
Quantum Biopharma
Industry
Eligibility
21 Years to 45 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated May 21, 2025 · Synced Sep 22, 2026, 10:08 AM 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 13, 2026 · Synced Sep 22, 2026, 10:08 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin K and Glucose Metabolism in Adults at Risk for Diabetes (Vita-K 'n' Adults Study)

NCT02366481
View directory record Official record
Conditions
Obesity, Insulin Resistance, Insulin Sensitivity, Beta-Cell Dysfunction, Prediabetes
Interventions
Placebo, Low-Dose Vitamin K2 Supplement (menaquinone-7; 90-mcg/d), High-Dose Vitamin K2 Supplement (menaquinone-7; 180-mcg/d)
Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2020
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 19, 2019 · Synced Sep 22, 2026, 10:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Enhanced Natural Killer Cell Activity and RBAC

NCT02019628
View directory record Official record
Conditions
Family Member
Interventions
Rice Bran Arabinoxylan Compound (RBAC)
Dietary Supplement
Lead sponsor
University of Miami
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Oct 9, 2023 · Synced Sep 22, 2026, 10:08 AM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Bioavailability of Vitamin D(25(OH)D) and Omega-3 Fatty Acid (DHA) Enhanced Chicken

NCT05248737
View directory record Official record
Conditions
Nutrition, Healthy
Interventions
DHA/EPA fortified chicken plus Placebo, non-25(OH)D fortified chicken/eggs plus vitamin D3 supplement, non-DHA bio-enhanced chicken plus supplement DHA Omega-3, 25(OH)D bioenhanced chicken and eggs plus placebo, Dietary Supplement: DHA/EPA fortified eggs plus Placebo, non-DHA bio-enhanced eggs plus supplement DHA Omega-3, non-25(OH)D fortified chicken/eggs plus placebo
Dietary Supplement · Other
Lead sponsor
Cornell University
Other
Eligibility
18 Years to 35 Years
Enrollment
84 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Mar 31, 2026 · Synced Sep 22, 2026, 10:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

RiteStart Personal Nutritional Dietary Study

NCT05130905
View directory record Official record
Conditions
Healthy Nutrition
Interventions
RiteStart Supplement
Dietary Supplement
Lead sponsor
4Life Research, LLC
Industry
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Sandy City, Utah
Source: ClinicalTrials.gov public record
Updated Nov 22, 2021 · Synced Sep 22, 2026, 10:08 AM EDT
Completed Not applicable Interventional

Effects of Exercise in People With Paraplegia

NCT01203150
View directory record Official record
Conditions
Spinal Cord Injury
Interventions
Exercise
Other
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 65 Years
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Mar 23, 2015 · Synced Sep 22, 2026, 10:08 AM EDT
Completed Phase 1 Interventional Results available

Vitamin D Supplementation in Crohn's Patients

NCT00742781
View directory record Official record
Conditions
Inflammatory Bowel Disease
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
Penn State University
Other
Eligibility
18 Years to 70 Years
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
2
States / cities
Hershey, Pennsylvania • University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 25, 2013 · Synced Sep 22, 2026, 10:08 AM EDT
Completed Not applicable Interventional Results available

The Effect of Hypovitaminosis D and Vitamin D Supplementation on Fracture Nonunion Rates

NCT01691833
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
113 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 13, 2022 · Synced Sep 22, 2026, 10:08 AM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

B-Complex: A Nutraceutical SANS Countermeasure

NCT05366933
View directory record Official record
Conditions
Optic Disc Edema, Endothelial Dysfunction
Interventions
Vitamin B-Complex Supplement
Drug
Lead sponsor
National Aeronautics and Space Administration (NASA)
Federal
Eligibility
20 Years to 100 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2032
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 21, 2025 · Synced Sep 22, 2026, 10:08 AM EDT
Withdrawn Phase 4 Interventional

EnBrace HR for PMS With Prominent Mood Symptoms or Menstrual Related Mood Disorders

NCT04123483
View directory record Official record
Conditions
Premenstrual Syndrome, Premenstrual Dysphoric Disorder, Premenstrual Tension, Menstrual Related Mood Disorder
Interventions
EnBrace HR Softgel
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 52 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 1, 2020 · Synced Sep 22, 2026, 10:08 AM 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 22, 2026, 10:08 AM EDT
Completed Phase 4 Interventional Results available

Effects of Teriparatide or Denosumab on Bone in Postmenopausal Women With Osteoporosis

NCT01753856
View directory record Official record
Conditions
Osteoporosis
Interventions
Teriparatide, Denosumab, Demeclocycline, Tetracycline, Calcium Supplement, Vitamin D
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
55 Years to 89 Years · Female only
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
4
States / cities
Lakewood, Colorado • Gainesville, Georgia • Detroit, Michigan + 1 more
Source: ClinicalTrials.gov public record
Updated Oct 7, 2015 · Synced Sep 22, 2026, 10:08 AM EDT
Completed Phase 3 Interventional Results available

Effects of Vitamin D and Fish Oil on the Kidney in Hypertensives

NCT02757872
View directory record Official record
Conditions
Hypertension, Kidney Diseases
Interventions
Vitamin D3, Omega-3 Fatty acids, Vitamin D3 placebo, Fish oil placebo
Dietary Supplement · Drug
Lead sponsor
Albert Einstein College of Medicine
Other
Eligibility
50 Years to 99 Years
Enrollment
2,232 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 30, 2024 · Synced Sep 22, 2026, 10:08 AM EDT
Not listed Not applicable Interventional

Diabetic Retinopathy Functional Evaluation Study: Monitoring Carotenoid Vitamins Treatment Using ERG

NCT04117022
View directory record Official record
Conditions
Diabetes, Diabetic Retinopathy
Interventions
DVS supplementation
Dietary Supplement
Lead sponsor
ZeaVision, LLC
Industry
Eligibility
21 Years to 80 Years
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
2
States / cities
Pomona, California • Tahlequah, Oklahoma
Source: ClinicalTrials.gov public record
Updated Apr 22, 2021 · Synced Sep 22, 2026, 10:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Prevention of Obesity in Military Communities - Fit4Duty

NCT02679937
View directory record Official record
Conditions
Obesity, Overweight, Adiposity
Interventions
Fit4Duty, Nutrition Education
Behavioral · Other
Lead sponsor
Henry M. Jackson Foundation for the Advancement of Military Medicine
Other
Eligibility
18 Years and older
Enrollment
119 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2017
U.S. locations
2
States / cities
Bethesda, Maryland • Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Feb 22, 2018 · Synced Sep 22, 2026, 10:08 AM 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 22, 2026, 10:08 AM EDT
Recruiting Not applicable Interventional

Carbohydrate Beta Cell Function and Glucose Control in Children With Diabetes

NCT05899166
View directory record Official record
Conditions
Diabetes Mellitus, Type 1
Interventions
Ketogenic diet, food delivery and education, Standard diet, food delivery and education
Other
Lead sponsor
Boston Children's Hospital
Other
Eligibility
5 Years to 12 Years
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 23, 2025 · Synced Sep 22, 2026, 10:08 AM EDT
Completed Phase 1 Interventional

Open Label Study: Treatment of ALS Fatigue With PolyMVA

NCT04557410
View directory record Official record
Conditions
Amyotrophic Lateral Sclerosis
Interventions
PolyMVA
Drug
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
Not listed
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated May 26, 2021 · Synced Sep 22, 2026, 10:08 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

The Effects of Vitamin C on Acute-Exercise in Postmenopausal Females

NCT07109115
View directory record Official record
Conditions
Females, Males, Menopause, Sedentary, Healthy Participants
Interventions
Vitamin C (Ascorbic Acid)
Dietary Supplement
Lead sponsor
University of Virginia
Other
Eligibility
45 Years and older
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Jul 16, 2026 · Synced Sep 22, 2026, 10:08 AM EDT
Recruiting Phase 2 Interventional

Essential Amino Acid Supplementation for Femoral Fragility Fractures

NCT06050668
View directory record Official record
Conditions
Femoral Fracture, Fragility Fracture, Muscle Atrophy
Interventions
Essential Amino Acid Supplementation
Combination Product
Lead sponsor
Michael C Willey
Other
Eligibility
65 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
2
States / cities
Iowa City, Iowa • Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 14, 2026 · Synced Sep 22, 2026, 10:08 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Acute Cognitive Effects of Brain Edge

NCT07018674
View directory record Official record
Conditions
Cognitive Health, Mood
Interventions
Experimental, Placebo, Water
Dietary Supplement · Other
Lead sponsor
Nature's Sunshine Products, Inc.
Industry
Eligibility
18 Years to 64 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Lehi, Utah
Source: ClinicalTrials.gov public record
Updated Apr 12, 2026 · Synced Sep 22, 2026, 10:08 AM EDT