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Showing 1–24 of 234 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Calcium & Vitamin D Clear all
Completed Not applicable Interventional

Randomized Study of Alendronate in Adult Patients With Cystic Fibrosis Related Osteoporosis

NCT00004489
View directory record Official record
Conditions
Osteoporosis, Cystic Fibrosis
Interventions
alendronate sodium, calcium carbonate, cholecalciferol
Drug
Lead sponsor
University of North Carolina
Other
Eligibility
18 Years to 45 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1998 – 2002
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 24, 2015 · Synced Sep 22, 2026, 2:30 AM EDT
Recruiting Phase 3 Interventional

Pediatric Safety Follow-up Study of Prior Treatment With Romosozumab for Osteogenesis Imperfecta

NCT07366086
View directory record Official record
Conditions
Osteogenesis Imperfecta
Interventions
Vitamin D, Calcium
Dietary Supplement
Lead sponsor
Amgen
Industry
Eligibility
5 Years to 19 Years
Enrollment
71 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Jun 21, 2026 · Synced Sep 22, 2026, 2:30 AM EDT
Completed Phase 3 Interventional Results available

Prevention of Osteoporosis in Bone Marrow Transplantation (BMT) Patients

NCT00824993
View directory record Official record
Conditions
Hematological Malignancies
Interventions
Ibandronate, Vitamin Supplements
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
78 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2017
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Sep 12, 2018 · Synced Sep 22, 2026, 2:30 AM EDT
Completed Not applicable Interventional Results available

Oral Paricalcitol in Kidney Transplant Recipients

NCT00587158
View directory record Official record
Conditions
Transplant; Failure, Kidney, Renal Disease, End Stage, Hyperparathyroidism, Secondary
Interventions
Paricalcitol, Corticosteroid Avoidance Immune Suppression Protocol
Drug · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
2
States / cities
Scottsdale, Arizona • Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 12, 2013 · Synced Sep 22, 2026, 2:30 AM 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 22, 2026, 2:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Calcium and Vitamin D Supplementation Decreases Incidence of Stress Fractures in Female Navy Recruits

NCT00476346
View directory record Official record
Conditions
Stress Fracture
Interventions
Calcium & Vitamin D
Dietary Supplement
Lead sponsor
Creighton University
Other
Eligibility
Female only
Enrollment
5,201 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2002 – 2006
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Mar 24, 2015 · Synced Sep 22, 2026, 2:30 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Role of Vitamin D in Menopause: Relationship to Menopausal Symptoms in Body Composition

NCT01141972
View directory record Official record
Conditions
Hot Flushes, Menopause, Premature, Obesity, Vitamin D Deficiency
Interventions
Vitamin D, Placebo
Dietary Supplement · Other
Lead sponsor
Kaiser Permanente
Other
Eligibility
40 Years to 60 Years · Female only
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated May 29, 2013 · Synced Sep 22, 2026, 2:30 AM 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 22, 2026, 2:30 AM EDT
Completed Not applicable Interventional

High-dose Vitamin D Supplementation for ADT-induced Side Effects

NCT02064946
View directory record Official record
Conditions
Prostatic Neoplasms, Bone Mineral Density Quantitative Trait Locus 3
Interventions
vitamin D, Placebo
Dietary Supplement
Lead sponsor
University of Rochester
Other
Eligibility
60 Years to 99 Years · Male only
Enrollment
108 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Apr 7, 2019 · Synced Sep 22, 2026, 2:30 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

A Study of Bone Turnover Markers in Post-Menopausal Women With Osteoporosis Treated With Monthly Boniva (Ibandronate)

NCT00303485
View directory record Official record
Conditions
Post Menopausal Osteoporosis
Interventions
Placebo, Vitamin D and calcium supplementation, ibandronate [Bonviva/Boniva]
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
65 Years and older · Female only
Enrollment
67 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2007
U.S. locations
7
States / cities
Beverly Hills, California • La Jolla, California • Augusta, Georgia + 4 more
Source: ClinicalTrials.gov public record
Updated May 1, 2016 · Synced Sep 22, 2026, 2:30 AM EDT
Completed Phase 4 Interventional

Study to Evaluate the Effects of Zemplar Injection and Calcijex on Intestinal Absorption of Calcium

NCT00073710
View directory record Official record
Conditions
Secondary Hyperparathyroidism, Chronic Kidney Disease
Interventions
Zemplar, 42 Ca carbonate absorption via single tracer method, Calcijex
Drug · Procedure
Lead sponsor
Abbott
Industry
Eligibility
20 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2004
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Aug 1, 2006 · Synced Sep 22, 2026, 2:30 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, 2:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Curves 30/30 Study

NCT04344821
View directory record Official record
Conditions
Weight Loss
Interventions
Curves Calcium, Placebo
Dietary Supplement
Lead sponsor
Texas A&M University
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
57 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Apr 14, 2020 · Synced Sep 22, 2026, 2:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Dried Plums Prevent Inflammation And Improve Bone Health in Osteopenic Men

NCT03408119
View directory record Official record
Conditions
Osteoporosis, Osteopenia
Interventions
Dried Plum, 800 IU vitamin D and 450mg elemental calcium
Dietary Supplement
Lead sponsor
Florida State University
Other
Eligibility
50 Years to 80 Years · Male only
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2022
U.S. locations
1
States / cities
Tallahassee, Florida
Source: ClinicalTrials.gov public record
Updated Oct 6, 2022 · Synced Sep 22, 2026, 2:30 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Study of Parental Ratings of Quality of Life and Body Composition in 5-19 Year Olds While Participating in the Good NEWS 4 Kids Program

NCT01855009
View directory record Official record
Conditions
Quality of Life, Body Mass Index
Interventions
MannaBears, AlgaeCal Calcium, Calcium carbonate, Vitamin D3
Dietary Supplement
Lead sponsor
Integrative Health Technologies, Inc.
Network
Eligibility
5 Years to 19 Years
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Jun 23, 2013 · Synced Sep 22, 2026, 2:30 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Role of Vitamin D in Female Reproductive Tract Immunity

NCT02186535
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D and Calcium
Dietary Supplement
Lead sponsor
CONRAD
Other
Eligibility
21 Years to 50 Years · Female only
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Jan 7, 2016 · Synced Sep 22, 2026, 2:30 AM EDT
Completed Phase 4 Interventional

The Forteo Alendronate Comparator Trial

NCT02416271
View directory record Official record
Conditions
Osteoporosis
Interventions
Teriparatide, Alendronate, Calcium, Vitamin D, Placebo-Oral, Placebo-SC
Drug · Dietary Supplement
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
45 Years to 85 Years · Female only
Enrollment
203 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2003
U.S. locations
15
States / cities
Mobile, Alabama • Tustin, California • Lakewood, Colorado + 12 more
Source: ClinicalTrials.gov public record
Updated Apr 13, 2015 · Synced Sep 22, 2026, 2:30 AM EDT
Active, not recruiting Phase 4 Interventional

Romosozumab Use to Build Skeletal Integrity

NCT05058976
View directory record Official record
Conditions
Osteoporosis, Osteoporosis, Postmenopausal, Osteoporosis Fracture
Interventions
Romosozumab, Placebo, Zoledronic acid, Calcium and Vitamin D
Drug · Dietary Supplement
Lead sponsor
Susan L. Greenspan
Other
Eligibility
65 Years and older · Female only
Enrollment
184 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 16, 2026 · Synced Sep 22, 2026, 2:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Patient Activation After DXA Result Notification

NCT01507662
View directory record Official record
Conditions
Osteoporosis, Bone Diseases, Metabolic
Interventions
Bone Mineral Density Result Letter and Bone Health Brochure
Behavioral
Lead sponsor
Fredric D Wolinsky
Other
Eligibility
50 Years and older
Enrollment
7,749 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2015
U.S. locations
3
States / cities
Birmingham, Alabama • Atlanta, Georgia • Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Nov 9, 2020 · Synced Sep 22, 2026, 2:30 AM EDT
Terminated Phase 2 Interventional Results available

Teriparatide (Forteo) in the Treatment of Patients With Postoperative Hypocalcemia

NCT00623974
View directory record Official record
Conditions
Hypocalcemia
Interventions
Teriparatide (Forteo), Calcium, Calcitriol
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Dec 5, 2012 · Synced Sep 22, 2026, 2:30 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 22, 2026, 2:30 AM EDT
Completed Not applicable Interventional

Prevention of Osteoporosis in Breast Cancer Survivors

NCT00567606
View directory record Official record
Conditions
Postmenopausal Osteoporosis
Interventions
Strength/Weight Training & Drug/Supplement, Drug/Supplement only
Other · Combination Product
Lead sponsor
University of Nebraska
Other
Eligibility
35 Years to 75 Years · Female only
Enrollment
249 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2007
U.S. locations
4
States / cities
Kearney, Nebraska • Lincoln, Nebraska • Omaha, Nebraska + 1 more
Source: ClinicalTrials.gov public record
Updated Nov 29, 2023 · Synced Sep 22, 2026, 2:30 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effect of Vitamin D and Calcium on Genes in the Colon

NCT00298545
View directory record Official record
Conditions
Colorectal Polyps, Colorectal Adenoma, Adenocarcinoma
Interventions
placebo and Calcitriol, Calcium and Calcitriol
Drug
Lead sponsor
Rockefeller University
Other
Eligibility
48 Years to 72 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2009
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 17, 2011 · Synced Sep 22, 2026, 2:30 AM EDT
Recruiting Phase 2 Interventional

Bone Metabolism in 12-21 Year Olds Undergoing Glucagon Like Peptide (GLP)-1 Receptor Agonist Therapy

NCT06903923
View directory record Official record
Conditions
Obesity in Children, Bone Strength, GLP - 1, Lifestyle Modification, Bone Density, Obesity
Interventions
GLP-1 receptor agonist, Lifestyle intervention
Drug · Behavioral
Lead sponsor
University of Virginia
Other
Eligibility
12 Years to 21 Years
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2030
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 16, 2026 · Synced Sep 22, 2026, 2:30 AM EDT