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Showing 1–24 of 335 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Vitamin A supplement Clear all
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 10, 2026 · Synced Sep 11, 2026, 7:32 AM EDT
Not listed Not applicable Interventional

Viome Precision Nutritional Programs to Improve Clinical Outcomes for Mental Health Conditions

NCT06190184
View directory record Official record
Conditions
Mental Health Issue, Mental Health Disorder, Mental Health, Depression, Depression, Anxiety, Anxiety, Anxiety Disorders, Anxiety Depression, Anxiety State
Interventions
VIOME Precision Nutrition Program, Control arm
Combination Product · Other
Lead sponsor
Viome
Industry
Eligibility
25 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Bothell, Washington
Source: ClinicalTrials.gov public record
Updated Jan 4, 2024 · Synced Sep 11, 2026, 7:32 AM EDT
Completed Early Phase 1 Interventional Results available

Treatment of HFpEF With Nitrate Supplement

NCT03289481
View directory record Official record
Conditions
Heart Failure With Normal Ejection Fraction
Interventions
Active lozenge, Placebo
Dietary Supplement · Drug
Lead sponsor
MaineHealth
Other
Eligibility
18 Years and older
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Rockport, Maine
Source: ClinicalTrials.gov public record
Updated Oct 5, 2021 · Synced Sep 11, 2026, 7:32 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 11, 2026, 7:32 AM 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 11, 2026, 7:32 AM 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 1, 2016 · Synced Sep 11, 2026, 7:32 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 11, 2026, 7:32 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 11, 2026, 7:32 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Study to Assess the Use of a Simple Lab Test to Screen for Rickets in Children

NCT00502866
View directory record Official record
Conditions
Rickets
Interventions
Not listed
Lead sponsor
Agency for Healthcare Research and Quality (AHRQ)
Federal
Eligibility
6 Months to 15 Months
Enrollment
246 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2008
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jan 7, 2014 · Synced Sep 11, 2026, 7:32 AM EDT
Recruiting Not applicable Interventional

Preserving Physical Function in Older Adults With Cancer: Impact of an Optimizing Nutrition Intervention Applied Before and After Surgery

NCT05912257
View directory record Official record
Conditions
Cancer
Interventions
Structured perioperative nutrition and exercise, Nutrition and Exercise Counseling
Behavioral
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
55 Years and older
Enrollment
188 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated May 19, 2026 · Synced Sep 11, 2026, 7:32 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 11, 2026, 7:32 AM EDT
Recruiting Not applicable Interventional

The Path Study: Cognitive and Inflammation Targeted Gut-brain Interventions in Alcohol; Probiotics, Alcohol, Transcutaneous Vagus Nerve Stimulation, and HIV Study

NCT05090267
View directory record Official record
Conditions
Cognition, Gut Microbiome
Interventions
Probiotic Supplement, Transcutaneous Vagal Nerve Stimulation (tVNS)
Dietary Supplement · Device
Lead sponsor
University of Florida
Other
Eligibility
35 Years to 70 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Coral Gables, Florida
Source: ClinicalTrials.gov public record
Updated Aug 5, 2026 · Synced Sep 11, 2026, 7:32 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers Results available

LungVITamin D and OmegA-3 Trial (lungVITAL)

NCT01728571
View directory record Official record
Conditions
COPD, Asthma, Pulmonary Function, Pneumonia
Interventions
Vitamin D3, fish oil, Vitamin D3 placebo, Fish oil placebo
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
25,871 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Sep 11, 2026, 7:32 AM EDT
Completed Phase 1Phase 2 Interventional

Treating Post-Lyme Disease Syndrome With Acetogenins

NCT04078841
View directory record Official record
Conditions
Post-Lyme Disease Syndrome (PLDS)
Interventions
ReaLife+ (RLP), Inert Brown powder
Dietary Supplement · Other
Lead sponsor
Optimal Health Research
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Feb 10, 2020 · Synced Sep 11, 2026, 7:32 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Prunes Preventing Bone Loss in Perimenopause

NCT07120997
View directory record Official record
Conditions
Perimenopausal Bone Loss
Interventions
Prunes, Calcium supplement, Vitamin D Supplement
Dietary Supplement
Lead sponsor
Penn State University
Other
Eligibility
44 Years to 55 Years · Female only
Enrollment
124 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2029
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 3, 2026 · Synced Sep 11, 2026, 7:32 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluate the Use of the Foundation Pain Index and the Nutritional Supplement BioPlete™ in Adults With Chronic Pain

NCT05278533
View directory record Official record
Conditions
Chronic Pain
Interventions
BioPlete™ Advanced Formula, Placebo
Dietary Supplement
Lead sponsor
Ethos Research & Development
Industry
Eligibility
30 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
2
States / cities
Tampa, Florida • West Palm Beach, Florida
Source: ClinicalTrials.gov public record
Updated Jun 21, 2023 · Synced Sep 11, 2026, 7:32 AM EDT
Completed Phase 3 Interventional Results available

Efficacy and Safety of Burosumab Versus Oral Phosphate and Active Vitamin D Treatment in Pediatric Patients With XLH

NCT02915705
View directory record Official record
Conditions
X-Linked Hypophosphatemia
Interventions
burosumab, Oral Phosphate Supplement, active vitamin D
Biological · Drug
Lead sponsor
Kyowa Kirin, Inc.
Industry
Eligibility
1 Year to 12 Years
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
5
States / cities
Los Angeles, California • San Francisco, California • Indianapolis, Indiana + 2 more
Source: ClinicalTrials.gov public record
Updated Aug 28, 2024 · Synced Sep 11, 2026, 7:32 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 11, 2026, 7:32 AM EDT
Completed Not applicable Interventional

Functional Medicine in Asthma (FAst) Study

NCT02808689
View directory record Official record
Conditions
Asthma
Interventions
Lifestyle Factors, Customized use of Dietary Supplements, Currently Accepted Asthma Care Guidelines
Behavioral · Other
Lead sponsor
The Cleveland Clinic
Other
Eligibility
19 Years to 65 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 31, 2021 · Synced Sep 11, 2026, 7:32 AM EDT
Terminated Phase 2Phase 3 Interventional

Vitamin B12 Status and Response to Vitamin B12 Supplementation in Patients With Parkinson's Disease

NCT00208611
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Vitamin B12 Supplementation
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
21 Years and older
Enrollment
57 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2010
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Dec 17, 2014 · Synced Sep 11, 2026, 7:32 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 11, 2026, 7:32 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin/Mineral Supplement for Children With Autism

NCT04845776
View directory record Official record
Conditions
Autism Spectrum Disorder
Interventions
ANRC Essentials Plus
Dietary Supplement
Lead sponsor
Arizona State University
Other
Eligibility
3 Years to 17 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Jan 8, 2023 · Synced Sep 11, 2026, 7:32 AM EDT
Completed Not applicable Interventional

Nutritional Supplements and Foot Surgery

NCT05522179
View directory record Official record
Conditions
Foot Injuries and Disorders
Interventions
NutraHeal, NutraHeal Plus
Dietary Supplement
Lead sponsor
NutraHeal
Industry
Eligibility
20 Years to 80 Years
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
3
States / cities
Altoona, Pennsylvania • Ebensburg, Pennsylvania • State College, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 31, 2023 · Synced Sep 11, 2026, 7:32 AM EDT
Active, not recruiting Phase 3 Interventional Accepts healthy volunteers

Combination Gerotherapeutic Interventions for Healthspan Improvement

NCT07475546
View directory record Official record
Conditions
Healthspan Improvement, Aging, Longevity
Interventions
Rapamycin, Naltrexone, Metformin, NAD+, GSH, Infinite Supplement, Placebo/control, B12, Intervention: Guided Meditation Program, Control: Podcast Listening Activity, Control: Standard Exercise Regimen, Intervention: Structured Exercise Program
Drug · Dietary Supplement · Behavioral
Lead sponsor
AgelessRx
Industry
Eligibility
60 Years to 80 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Mar 15, 2026 · Synced Sep 11, 2026, 7:32 AM EDT