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Showing 1–23 of 23 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Calcium carbonate supplement Clear all
Completed Phase 2 Interventional

Calcium and Vitamin D vs Markers of Adenomatous Polyps

NCT00208793
View directory record Official record
Conditions
Colorectal Adenomatous Polyps
Interventions
Calcium and vitamin D3 combined, Placebo, Calcium, Vitamin D3
Dietary Supplement · Drug
Lead sponsor
Emory University
Other
Eligibility
30 Years to 74 Years
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2013
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 25, 2013 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Phase 3 Interventional

Supplemental Calcium in Overweight People

NCT00030238
View directory record Official record
Conditions
Obesity
Interventions
Calcium supplement, Placebo
Drug
Lead sponsor
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NIH
Eligibility
18 Years and older
Enrollment
540 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2007
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 21, 2019 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Effect of Chewing a Calcium Supplement Before Fluoride Rinse on Salivary Fluoride

NCT04620252
View directory record Official record
Conditions
Dental Caries
Interventions
Inactive supplement, Tricalcium phosphate supplement, Calcium carbonate supplement, Calcium citrate supplement, Inactive supplement and fluoride mouthwash, Calcium carbonate supplement and fluoride mouthwash, Calcium citrate supplement and fluoride mouthwash
Drug
Lead sponsor
University of Michigan
Other
Eligibility
18 Years to 99 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated May 8, 2022 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Alpha Hope Dietary Supplement on Health and Cognitive Performance

NCT05589051
View directory record Official record
Conditions
Cognitive Change
Interventions
Drink
Dietary Supplement
Lead sponsor
University of Memphis
Other
Eligibility
40 Years to 70 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Sep 25, 2023 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A New Paradigm for Vitamin D Sufficiency

NCT02969850
View directory record Official record
Conditions
New Biomarkers for Measuring Vitamin D Level
Interventions
Vitamin D Supplementation, Placebo, Calcium
Dietary Supplement · Other
Lead sponsor
NYU Langone Health
Other
Eligibility
60 Years to 90 Years · Female only
Enrollment
444 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Oct 21, 2021 · Synced Sep 8, 2026, 9:30 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 8, 2026, 9:30 AM EDT
Completed Phase 2 Interventional Results available

Safety and Efficacy of Alendronate (Fosamax) in Children With Osteoporosis

NCT00259857
View directory record Official record
Conditions
Osteoporosis
Interventions
Alendronate
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
5 Years to 15 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2009
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jan 18, 2011 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Effect of Soluble Corn Fiber Supplementation for 1 Year on Bone Metabolism in Adolescents

NCT02916862
View directory record Official record
Conditions
Osteoporosis
Interventions
Soluble Corn Fiber (SCF) without Calcium, Soluble Corn Fiber (SCF) + Calcium, Placebo, Placebo + calcium
Dietary Supplement · Combination Product
Lead sponsor
Florida International University
Other
Eligibility
9 Years to 14 Years
Enrollment
177 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2025
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Nov 9, 2025 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Effects of Carbohydrate in Diet and Supplements on the Gastrointestinal Tolerability of LIK066

NCT03198767
View directory record Official record
Conditions
Obesity
Interventions
LIK066, Carbohydrate 50%, Carbohydrate 25%, Carbohydrate 8%, Carbohydrate 0%, Psyllium, Calcium carbonate
Drug · Dietary Supplement
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 65 Years
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Lincoln, Nebraska
Source: ClinicalTrials.gov public record
Updated Jan 4, 2021 · Synced Sep 8, 2026, 9:30 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 8, 2026, 9:30 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effect of Calcium on Tasigna Pharmacokinetics (PK) in Healthy Volunteers

NCT00732888
View directory record Official record
Conditions
Healthy
Interventions
Nilotinib Hydrochloride, calcium carbonate
Drug · Dietary Supplement
Lead sponsor
Jan Beumer
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2011
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 17, 2013 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Calcium Supplement Particle Size and Vitamin D Supplement on Calcium Retention in Adolescent Girls

NCT01005381
View directory record Official record
Conditions
Osteoporosis
Interventions
Small Particle Size Calcium Carbonate Supplement, Large Particle Size Calcium Carbonate Supplement, Vitamin D, Calcium Placebo
Dietary Supplement
Lead sponsor
Purdue University
Other
Eligibility
12 Years to 14 Years · Female only
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated May 8, 2018 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Phase 2 Interventional Results available

Celecoxib After Tonsillectomy

NCT02934191
View directory record Official record
Conditions
Tonsillectomy
Interventions
Celecoxib, Placebo, Acetaminophen, Oxycodone
Drug · Other
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
3 Years to 11 Years
Enrollment
172 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 9, 2020 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Phase 3 Interventional Results available

Heartland Osteoporosis Prevention Study

NCT02186600
View directory record Official record
Conditions
Osteopenia
Interventions
Calcium Carbonate, Vitamin D3, Risedronate, Bone-loading exercises
Drug · Behavioral
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older · Female only
Enrollment
276 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Oct 4, 2023 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Effectiveness of Supplemental Calcium in Preventing Postpartum Depression

NCT00228033
View directory record Official record
Conditions
Depression, Depression, Postpartum
Interventions
Elemental calcium (as carbonate)
Drug
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years and older · Female only
Enrollment
238 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2002 – 2007
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Mar 19, 2014 · Synced Sep 8, 2026, 9:30 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin Supplementation After Bariatric Surgery

NCT02686905
View directory record Official record
Conditions
Complications of Bariatric Procedures, Avitaminosis
Interventions
Chewable Multivitamin with Iron, PatchMD Vitamin D3/Calcium Patch, PatchMD Multivitamin Patch, PatchMD B12 Energy Plus Patch, Chewable Calcium, Quick Dissolve B12
Dietary Supplement
Lead sponsor
California State Polytechnic University, Pomona
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Brea, California
Source: ClinicalTrials.gov public record
Updated Sep 29, 2016 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effect of Calcium on Gleevec Pharmacokinetics (PK) in Healthy Volunteers

NCT00732784
View directory record Official record
Conditions
Healthy
Interventions
Imatinib mesylate, calcium carbonate
Drug · Dietary Supplement
Lead sponsor
Jan Beumer
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2012
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 17, 2013 · Synced Sep 8, 2026, 9:30 AM EDT
Withdrawn Not applicable Interventional

Antiorbital Calcium in Chronic Conditions

NCT05302713
View directory record Official record
Conditions
Atrial Fibrillation
Interventions
Ionic Calcium, Calcium Carbonate
Dietary Supplement
Lead sponsor
National University of Natural Medicine
Other
Eligibility
55 Years to 75 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Aug 6, 2024 · Synced Sep 8, 2026, 9:30 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 8, 2026, 9:30 AM EDT
Active, not recruiting Phase 2 Interventional Accepts healthy volunteers

PhytoSERM to Prevent Menopause Associated Decline in Brain Metabolism and Cognition

NCT05664477
View directory record Official record
Conditions
Menopause, Cognitive Change, Brain Disorder, Metabolic
Interventions
PhytoSERM, Placebo
Dietary Supplement · Drug
Lead sponsor
Roberta Brinton
Other
Eligibility
45 Years to 60 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
2
States / cities
Tucson, Arizona • New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 12, 2026 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Calcium and Lipid Metabolism

NCT00686192
View directory record Official record
Conditions
Obesity
Interventions
Calcium Carbonate
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
20 Years to 40 Years · Female only
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2001 – 2002
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jul 21, 2008 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Not applicable Interventional

Pamidronate, Vitamin D, and Calcium for the Bone Disease of Kidney and Heart Transplantation

NCT00302627
View directory record Official record
Conditions
Transplant Bone Disease
Interventions
Pamidronate, vitamin D, Calcium Carbonate
Drug
Lead sponsor
Providence Health & Services
Other
Eligibility
18 Years and older
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2002
U.S. locations
1
States / cities
Spokane, Washington
Source: ClinicalTrials.gov public record
Updated Aug 28, 2018 · Synced Sep 8, 2026, 9:30 AM EDT
Completed Phase 2 Interventional

Calcium Supplements for Bone Health in Juvenile Rheumatoid Arthritis

NCT00000429
View directory record Official record
Conditions
Juvenile Rheumatoid Arthritis
Interventions
Calcium carbonate
Drug
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
6 Years to 18 Years
Enrollment
192 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1996 – 2001
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 31, 2013 · Synced Sep 8, 2026, 9:30 AM EDT