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Showing 1–24 of 349 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Placebo of calcium Clear all
Completed Phase 4 Interventional Accepts healthy volunteers

How Does Magnesium Status Influence Calcium Homeostasis?

NCT01593501
View directory record Official record
Conditions
Magnesium Deficiency, Calcium Metabolism Disorders
Interventions
vitamin D3
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
30 Years to 75 Years · Female only
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 31, 2016 · Synced Sep 4, 2026, 2:53 PM EDT
Withdrawn Phase 2 Interventional

A Phase 2 Trial Evaluating SNC-102 in Drug-Induced Tardive Dyskinesia

NCT02064010
View directory record Official record
Conditions
Drug-induced Tardive Dyskinesia
Interventions
SNC-102, Placebo
Drug
Lead sponsor
Synchroneuron Inc.
Industry
Eligibility
18 Years to 75 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 12, 2021 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Phase 2 Interventional

PRebiotic to IMprovE Calcium Absorption

NCT03272542
View directory record Official record
Conditions
Obesity
Interventions
Prebiotic: soluble corn fiber, Placebo: maltodextrin
Dietary Supplement
Lead sponsor
San Francisco Veterans Affairs Medical Center
Federal
Eligibility
18 Years to 75 Years · Female only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Oct 21, 2020 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Efficacy and Safety Study for an Oral Contraceptive Containing Folate

NCT00468481
View directory record Official record
Conditions
Neural Tube Defects, Contraception, Oral Contraceptives (OC)
Interventions
Drospirenone/Ethinylestradiol/Methyltetrahydrofolate, Drospirenone/Ethinylestradiol (Yaz)
Drug
Lead sponsor
Bayer
Industry
Eligibility
18 Years to 40 Years · Female only
Enrollment
385 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
9
States / cities
Anaheim, California • San Diego, California • Baltimore, Maryland + 6 more
Source: ClinicalTrials.gov public record
Updated Apr 22, 2014 · Synced Sep 4, 2026, 2:53 PM EDT
Terminated Phase 3 Interventional Accepts healthy volunteers Results available

Averting Complications of Proton Pump Inhibitor Therapy by Effervescent Calcium Magnesium Citrate

NCT03812380
View directory record Official record
Conditions
Osteoporosis, Hypomagnesemia
Interventions
EffCaMgCit, Placebo
Drug · Other
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
21 Years to 99 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Aug 16, 2022 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Phase 2 Interventional Results available

Dexamethasone Dyspnea Study

NCT01670097
View directory record Official record
Conditions
Advanced Cancers, Hematologic Disorder, Solid Tumors
Interventions
Dexamethasone, Placebo, Questionnaires, Spirometer, Phone Calls
Drug · Behavioral · Device + 1 more
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2021
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Feb 16, 2021 · Synced Sep 4, 2026, 2:53 PM EDT
Active, not recruiting Phase 2 Interventional Results available

Vitamin D and Physical Activity on Bone Health

NCT01419730
View directory record Official record
Conditions
Bone Metabolism Biomarkers, Bone Mineral Density, Physical Fitness
Interventions
Vitamin D3, Physical Activity
Drug · Behavioral
Lead sponsor
University of Rochester
Other
Eligibility
18 Years to 99 Years · Female only
Enrollment
191 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2026
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Aug 4, 2026 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Prevention of Enamel Demineralization Using CPP-ACP-NaF Varnish

NCT04002232
View directory record Official record
Conditions
Demineralization
Interventions
CPP-ACP-NaF varnish
Device
Lead sponsor
University of Colorado, Denver
Other
Eligibility
10 Years to 80 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 6, 2021 · Synced Sep 4, 2026, 2:53 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Joint Health Study

NCT05438979
View directory record Official record
Conditions
Effect of Drug
Interventions
Placebo, Calcium Fructoborate
Dietary Supplement
Lead sponsor
Auburn University
Other
Eligibility
40 Years to 65 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Auburn, Alabama
Source: ClinicalTrials.gov public record
Updated Aug 15, 2023 · Synced Sep 4, 2026, 2:53 PM EDT
Not listed Phase 4 Interventional Accepts healthy volunteers

Effects of Omega-3 Fatty Acids on Bone and Frailty

NCT00634686
View directory record Official record
Conditions
Osteoporosis, Frailty
Interventions
DHA/EPA, Placebo capsule, Calcium with vitamin D
Dietary Supplement
Lead sponsor
Donaghue Medical Research Foundation
Other
Eligibility
65 Years and older · Female only
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Farmington, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 1, 2009 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Phase 3 Interventional Results available

Effect of Teriparatide on Hip Fracture Healing

NCT01473589
View directory record Official record
Conditions
Femur Neck Fracture
Interventions
Teriparatide, Placebo, Calcium supplementation, Vitamin D supplementation
Drug · Dietary Supplement
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
50 Years and older
Enrollment
122 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
24
States / cities
Phoenix, Arizona • Tucson, Arizona • La Mesa, California + 21 more
Source: ClinicalTrials.gov public record
Updated Apr 15, 2015 · Synced Sep 4, 2026, 2:53 PM EDT
Terminated Phase 2 Interventional Results available

Phase 2 Dose-finding IMU-838 for Ulcerative Colitis

NCT03341962
View directory record Official record
Conditions
Ulcerative Colitis
Interventions
IMU-838, Placebo
Drug
Lead sponsor
Immunic AG
Industry
Eligibility
18 Years to 80 Years
Enrollment
263 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
15
States / cities
Tucson, Arizona • Los Angeles, California • Ventura, California + 12 more
Source: ClinicalTrials.gov public record
Updated Mar 4, 2024 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

CYP3A4 Activity and Mineral Homeostasis

NCT02019875
View directory record Official record
Conditions
Vitamin D and Calcium Homeostasis
Interventions
Rifampin, Clarithromycin, Grapefruit Juice, Placebo
Drug · Other
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 60 Years
Enrollment
92 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2020
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Apr 18, 2023 · Synced Sep 4, 2026, 2:53 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

An Efficacy Trial in the Research Area of Gastrointestinal Health & Bloating

NCT05418127
View directory record Official record
Conditions
Gastrointestinal Dysfunction
Interventions
Active, Placebo
Dietary Supplement · Other
Lead sponsor
Coconut Goodness Food Products Inc.
Industry
Eligibility
25 Years to 54 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jan 18, 2023 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Preoperative Carbohydrate Rich Drinks on Immediate Postoperative Outcome in Total Knee Arthroplasty

NCT03380754
View directory record Official record
Conditions
Post Operative Nausea and Vomiting
Interventions
Nutricia preOp, Nestle Splash Lemon Flavor Water (Placebo)
Dietary Supplement · Other
Lead sponsor
Henry Ford Health System
Other
Eligibility
18 Years and older
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Feb 16, 2020 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Single-Center Investigator-Initiated Evaluator-Bilateral-Comparison Pilot Study of Injectable Calcium Hydroxylapatite With and Without Triamcinolone Acetate for the Treatment of Volume Loss to Dorsum Areas of the Hands

NCT02454088
View directory record Official record
Conditions
Volume Loss to Dorsum of Hands
Interventions
Calcium Hydroxylapatite and Triamcinolone acetate, Calcium Hydroxylapatite and Placebo
Other · Device
Lead sponsor
Goldman, Butterwick, Fitzpatrick and Groff
Other
Eligibility
22 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Feb 28, 2017 · Synced Sep 4, 2026, 2:53 PM EDT
Withdrawn Phase 1Phase 2 Interventional

Traumatic Brain Injury and Effects of Acute Cyclosporine A

NCT02496975
View directory record Official record
Conditions
Traumatic Brain Injury
Interventions
Cyclosporine A, Placebo
Drug · Other
Lead sponsor
Edward Hall,PhD
Other
Eligibility
18 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Oct 25, 2017 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Not applicable Interventional Results available

Dexamethasone in Reducing Oral Pain and Dry Mouth After Surgery in Patients With Oropharyngeal Cancer

NCT01748942
View directory record Official record
Conditions
Dysphagia, Pain, Stage I Oropharyngeal Squamous Cell Carcinoma, Stage II Oropharyngeal Squamous Cell Carcinoma, Stage III Oropharyngeal Squamous Cell Carcinoma
Interventions
Dexamethasone, Placebo, Quality-of-Life Assessment, Questionnaire Administration, Transoral Robotic Surgery
Drug · Other · Procedure
Lead sponsor
OHSU Knight Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
76 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2017
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jun 18, 2018 · Synced Sep 4, 2026, 2:53 PM EDT
Withdrawn Not applicable Interventional

Efficacy Study of Cardizem in Pulmonary Arterial Hypertension

NCT01645826
View directory record Official record
Conditions
Idiopathic Pulmonary Arterial Hypertension, Primary Pulmonary Hypertension, Pulmonary Arterial Hypertension, Familial Primary Pulmonary Hypertension
Interventions
Diltiazem Hydrochloride, Sugar Pill
Drug
Lead sponsor
University of South Florida
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Nov 19, 2018 · Synced Sep 4, 2026, 2:53 PM EDT
Not listed Phase 4 Interventional

The Effect of Vitamin D Supplementation on Calcium Excretion in Thalassemia: a Dose Response Study

NCT01323608
View directory record Official record
Conditions
Thalassemia Major
Interventions
Vitamin D3, Placebo
Drug
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
6 Years to 60 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 18, 2011 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Phase 2 Interventional Results available

A Study of Auxora in Patients With Severe COVID-19 Pneumonia

NCT04345614
View directory record Official record
Conditions
Pneumonia
Interventions
Auxora (Part 1), Standard of Care (Part 1), Auxora (Part 2), Placebo (Part 2)
Drug
Lead sponsor
CalciMedica, Inc.
Industry
Eligibility
18 Years and older
Enrollment
314 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
17
States / cities
Long Beach, California • Los Angeles, California • San Diego, California + 13 more
Source: ClinicalTrials.gov public record
Updated Mar 29, 2026 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Not applicable Interventional Results available

Vitamin D, Insulin Resistance, and Cardiovascular Disease

NCT00736632
View directory record Official record
Conditions
Vitamin D Deficiency, Insulin Resistance, Type 2 Diabetes Mellitus, Cardiovascular Disease, Hypertension
Interventions
Vitamin D3, Placebo
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
25 Years to 80 Years
Enrollment
125 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2019
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Feb 9, 2020 · Synced Sep 4, 2026, 2:53 PM EDT
Completed Phase 3 Interventional Results available

Evaluate Safety and Efficacy of ABT-335 in Combination With Atorvastatin in Subjects With Multiple Abnormal Lipid Levels in the Blood

NCT00300469
View directory record Official record
Conditions
Mixed Dyslipidemia, Coronary Heart Disease, Dyslipidemia
Interventions
ABT-335, Atorvastatin, Placebo
Drug
Lead sponsor
Abbott
Industry
Eligibility
18 Years and older
Enrollment
613 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2006
U.S. locations
1
States / cities
North Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 2, 2009 · Synced Sep 4, 2026, 2:53 PM EDT
Active, not recruiting Phase 3 Interventional

Study to Evaluate the Efficacy, Safety, and Tolerability of IMU-838 in Patients With Relapsing Multiple Sclerosis

NCT05134441
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
IMU-838 tablets, Placebo matching IMU-838 tablets
Drug
Lead sponsor
Immunic AG
Industry
Eligibility
18 Years to 55 Years
Enrollment
1,121 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2033
U.S. locations
6
States / cities
Phoenix, Arizona • West Hollywood, California • Bradenton, Florida + 3 more
Source: ClinicalTrials.gov public record
Updated Feb 22, 2026 · Synced Sep 4, 2026, 2:53 PM EDT