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Showing 1–22 of 22 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Calcium Carbonate 500 MG Clear all
Active, not recruiting Not applicable Interventional

Calcium Carbonate on Labor Induction

NCT06352775
View directory record Official record
Conditions
Pregnancy, Uterine Contraction
Interventions
Calcium Carbonate
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older · Female only
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 20, 2025 · Synced Sep 27, 2026, 1:45 AM EDT
Not listed Phase 3 Interventional

Study Comparing Effects of Lanthanum Carbonate Versus Calcium Acetate Versus Dietary Phosphorus Restriction

NCT01357317
View directory record Official record
Conditions
Chronic Kidney Disease
Interventions
Diet counseling, Phosphorus binder
Other · Drug
Lead sponsor
Salem Veterans Affairs Medical Center
Federal
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Salem, Virginia
Source: ClinicalTrials.gov public record
Updated Jun 11, 2012 · Synced Sep 27, 2026, 1:45 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

A Study of Changes in Bone Mineral Density as a Function of Consuming Two Different Forms of Calcium Carbonate

NCT01857154
View directory record Official record
Conditions
Osteopenia, Osteoporosis
Interventions
Micronized Calcium Carbonate, Non-Micronized Calcium Carbonate, Vitamin D3
Dietary Supplement
Lead sponsor
Integrative Health Technologies, Inc.
Network
Eligibility
21 Years and older
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Nov 24, 2013 · Synced Sep 27, 2026, 1:45 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Encapsulated Calcium Absorption in Pregnancy

NCT01678079
View directory record Official record
Conditions
Pregnancy
Interventions
Encapsulated Calcium, Non-capsulated Calcium
Dietary Supplement
Lead sponsor
The Hospital for Sick Children
Other
Eligibility
18 Years to 30 Years · Female only
Enrollment
61 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
2
States / cities
Baltimore, Maryland • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Nov 17, 2014 · Synced Sep 27, 2026, 1:45 AM 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 27, 2026, 1:45 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Antacid Interaction Study

NCT01982201
View directory record Official record
Conditions
Healthy
Interventions
Lesinurad 400 mg, Tums 500 mg and 750 mg, MINTOX 10 mL
Drug
Lead sponsor
Ardea Biosciences, Inc.
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
Kalamazoo, Michigan
Source: ClinicalTrials.gov public record
Updated May 19, 2014 · Synced Sep 27, 2026, 1:45 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Analysis of MicroBial Metabolites After Eating Refined Food

NCT04308473
View directory record Official record
Conditions
Dietary Habits
Interventions
Ultra-processed Food Meal, Whole Food Meal
Other
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2026
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 24, 2026 · Synced Sep 27, 2026, 1:45 AM EDT
Completed Phase 2 Interventional Results available

High Dose Vitamin D and Calcium for Bone Health in Individuals Initiating HAART

NCT01403051
View directory record Official record
Conditions
HIV-1 Infection
Interventions
EFV/FTC/TDF, Calcium Carbonate, Vitamin D3, Placebo for calcium carbonate, Placebo for vitamin D3
Drug
Lead sponsor
Advancing Clinical Therapeutics Globally for HIV/AIDS and Other Infections
Network
Eligibility
18 Years and older
Enrollment
167 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
38
States / cities
Birmingham, Alabama • Los Angeles, California • Palo Alto, California + 27 more
Source: ClinicalTrials.gov public record
Updated Oct 11, 2018 · Synced Sep 27, 2026, 1:45 AM EDT
Completed Phase 2Phase 3 Interventional Results available

Vitamin D/Calcium Polyp Prevention Study

NCT00153816
View directory record Official record
Conditions
Colorectal Cancer, Polyps, Adenomas
Interventions
Calcium Carbonate, Vitamin D3, placebo
Drug
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
45 Years to 75 Years
Enrollment
2,813 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2016
U.S. locations
10
States / cities
Los Angeles, California • Denver, Colorado • Atlanta, Georgia + 7 more
Source: ClinicalTrials.gov public record
Updated Mar 14, 2017 · Synced Sep 27, 2026, 1:45 AM EDT
Completed Not applicable Interventional Results available

A Double Blind Randomized Placebo Trial of Maintenance of Normal Serum Phosphorus in CKD

NCT00785629
View directory record Official record
Conditions
Chronic Kidney Disease
Interventions
Calcium acetate, Lanthanum Carbonate, Sevelamer Carbonate, Placebo
Drug
Lead sponsor
Denver Nephrologists, P.C.
Other
Eligibility
18 Years and older
Enrollment
148 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Oct 29, 2012 · Synced Sep 27, 2026, 1:45 AM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Calcium Carbonate to Augment Labor Contractions

NCT06580782
View directory record Official record
Conditions
Labor Dystocia, Labor Induction, Labor Augmentation
Interventions
Calcium Carbonate 500 MG, Standard Dose Synthetic Pitocin
Drug
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years and older · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 22, 2025 · Synced Sep 27, 2026, 1:45 AM EDT
Active, not recruiting Phase 3 Interventional

Ropeginterferon Alfa-2b (P1101) vs. Anagrelide in Essential Thrombocythemia Patients With Hydroxyurea Resistance or Intolerance

NCT04285086
View directory record Official record
Conditions
Essential Thrombocythemia
Interventions
Ropeginterferon alfa-2b, Anagrelide
Biological · Drug
Lead sponsor
PharmaEssentia
Industry
Eligibility
18 Years and older
Enrollment
174 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2029
U.S. locations
4
States / cities
Scottsdale, Arizona • St Louis, Missouri • Houston, Texas + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 21, 2026 · Synced Sep 27, 2026, 1:45 AM EDT
Completed Not applicable Interventional

Vitamin D, Cardiovascular Disease, and African Americans

NCT01655810
View directory record Official record
Conditions
Vitamin D Deficiency, Type 2 Diabetes Mellitus, Cardiovascular Disease
Interventions
Vitamin D3, Calcium carbonate
Dietary Supplement
Lead sponsor
Washington University School of Medicine
Other
Eligibility
50 Years to 70 Years
Enrollment
86 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2018
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 4, 2020 · Synced Sep 27, 2026, 1:45 AM EDT
Terminated Phase 3 Interventional

A Study to Determine Effective Prophylaxis and Treatment of Nelfinavir-Associated Diarrhea

NCT00650637
View directory record Official record
Conditions
Diarrhea
Interventions
Calcium Carbonate, nelfinavir, lamivudine, loperamide, Calcium carbonate not administered, lamivudine + zidovudine
Drug · Other
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003
U.S. locations
6
States / cities
Birmingham, Alabama • Fort Lauderdale, Florida • New York, New York + 3 more
Source: ClinicalTrials.gov public record
Updated Jun 7, 2011 · Synced Sep 27, 2026, 1:45 AM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Calcium-Rich Food Versus Calcium Carbonate for Bone Health

NCT07763509
View directory record Official record
Conditions
Osteopenia, Osteoporosis, Bone Health in Perimenopausal Women, Menopause Related Conditions, Fracture Healing
Interventions
500 mg calcium from milk-derived minerals, Calcium Carbonate 500 MG
Other · Dietary Supplement
Lead sponsor
Cornell University
Other
Eligibility
40 Years to 90 Years · Female only
Enrollment
217 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 12, 2026 · Synced Sep 27, 2026, 1:45 AM EDT
Completed Not applicable Interventional Results available

Calcium and Phosphorus Balance and Calcium Kinetics in Patients With Stage 3/4 Chronic Kidney Disease

NCT01161407
View directory record Official record
Conditions
Chronic Kidney Disease
Interventions
1500 mg/d elemental calcium as calcium carbonate, Placebo
Dietary Supplement
Lead sponsor
Indiana University
Other
Eligibility
35 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Jul 28, 2014 · Synced Sep 27, 2026, 1:45 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Drug-drug Interaction Study of TPOXX When Co-administered With Phosphate Binders

NCT04485039
View directory record Official record
Conditions
Smallpox
Interventions
Tecovirimat, sevelamer carbonate oral tablet, sucroferric oxyhydroxide chewable tablet, calcium acetate oral tablet, Lanthanum Carbonate Chewable Tablet
Drug
Lead sponsor
SIGA Technologies
Industry
Eligibility
18 Years to 50 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Sep 27, 2026, 1:45 AM EDT
Completed Phase 2 Interventional Results available

Zoledronic Acid in Preventing Osteoporosis in Patients Undergoing Donor Stem Cell Transplant

NCT00321932
View directory record Official record
Conditions
Leukemia, Lymphoma, Myelodysplastic Syndromes, Osteoporosis, Ovarian Cancer
Interventions
calcium, cholecalciferol, zoledronic acid
Dietary Supplement · Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2012
U.S. locations
2
States / cities
Minneapolis, Minnesota • Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Mar 8, 2017 · Synced Sep 27, 2026, 1:45 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Vitamin D HIV Study on Postmenopausal Women

NCT01375010
View directory record Official record
Conditions
HIV
Interventions
Vitamin D3, Placebo, Vitamin Supplements
Drug · Other
Lead sponsor
Columbia University
Other
Eligibility
40 Years to 70 Years · Female only
Enrollment
85 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 6, 2019 · Synced Sep 27, 2026, 1:45 AM EDT
Completed Phase 2Phase 3 Interventional

Efficacy of a Novel Multivitamin-Mineral Supplement in Preventing Vitamin Deficiency in Postoperative Bariatric Patients

NCT01475617
View directory record Official record
Conditions
Bariatric Surgery Candidate
Interventions
AquaVanta Chewable Tablet, Flinstones Complete, Nature Made Calcium Softgels, Twin Labs Iron Caps, Rexall Vitamin B12 Tablet
Dietary Supplement
Lead sponsor
Yasoo Health
Industry
Eligibility
18 Years to 65 Years
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 21, 2015 · Synced Sep 27, 2026, 1:45 AM 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 27, 2026, 1:45 AM EDT
Completed Phase 3 Interventional Results available

A Double-Blind, Placebo-Controlled Trial of Anti-Aging, Pro-Autophagy Effects of Metformin in Adults With Prediabetes

NCT03309007
View directory record Official record
Conditions
PreDiabetes, Aging
Interventions
Metformin, Placebo Oral Tablet
Drug
Lead sponsor
University of New Mexico
Other
Eligibility
30 Years to 70 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Dec 10, 2023 · Synced Sep 27, 2026, 1:45 AM EDT