- 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
Search Results
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Search by query text, NCT ID, condition, intervention, sponsor, city, state, recruitment status, phase, study type, healthy volunteer eligibility, sex, or age. Results are retrieved from ClinicalTrials.gov and synchronized into the directory. Search pages remain noindex by default.
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Showing 1–24
of 767
matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
- Conditions
- Vitamin D Deficiency, Arterial Stiffness
- Interventions
- Low dose vitamin D3, High dose vitamin D3
- Dietary Supplement
- Lead sponsor
- Texas Tech University Health Sciences Center
- Other
- Eligibility
- 65 Years to 89 Years
- Enrollment
- 52 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2018 – 2021
- U.S. locations
- 1
- States / cities
- Lubbock, Texas
- Conditions
- Autoimmune Diseases, Systemic Inflammatory Process, Knee Pain Chronic, Osteoarthritis, Rheumatoid Arthritis
- Interventions
- Fish Oil, Vitamin D, placebo pill
- Drug · Dietary Supplement · Other
- Lead sponsor
- Brigham and Women's Hospital
- Other
- Eligibility
- 50 Years and older
- Enrollment
- 25,871 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2010 – 2025
- U.S. locations
- 1
- States / cities
- Boston, Massachusetts
- Conditions
- Vitamin D Deficiency, Stem Cell Transplant Complications, Pediatric Cancer, Blood Disorder, Pediatric Acute Myeloid Leukemia, Pediatric Acute Lymphoid Leukemia, Myelodysplastic Syndromes, Sickle Cell Anemia in Children, Aplastic Anemia, Thalassemia in Children
- Interventions
- Vitamin D3, Standard Vitamin D3 Supplementation
- Dietary Supplement
- Lead sponsor
- Phoenix Children's Hospital
- Other
- Eligibility
- 1 Year to 25 Years
- Enrollment
- 49 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2017 – 2019
- U.S. locations
- 1
- States / cities
- Phoenix, Arizona
- Conditions
- Melanoma
- Interventions
- Not listed
- Lead sponsor
- New Mexico Cancer Research Alliance
- Other
- Eligibility
- 18 Years and older
- Enrollment
- 9 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2008 – 2010
- U.S. locations
- 1
- States / cities
- Albuquerque, New Mexico
- Conditions
- X-Linked Hypophosphatemia
- Interventions
- KRN23
- Biological
- Lead sponsor
- Kyowa Kirin, Inc.
- Industry
- Eligibility
- Not listed
- Enrollment
- 20 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2015 – 2018
- U.S. locations
- 5
- States / cities
- San Francisco, California • New Haven, Connecticut • Indianapolis, Indiana + 2 more
- Conditions
- Sarcopenia
- Interventions
- Placebo, HMB plus Vitamin D, Non-Exercise, Exercise
- Dietary Supplement · Drug · Behavioral
- Lead sponsor
- Metabolic Technologies Inc.
- Industry
- Eligibility
- 60 Years and older
- Enrollment
- 238 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2014 – 2019
- U.S. locations
- 1
- States / cities
- Ames, Iowa
- Conditions
- Chronic Kidney Diseases, Deficiency, Vitamin D
- Interventions
- Cholecalciferol
- Dietary Supplement
- Lead sponsor
- University of Colorado, Denver
- Other
- Eligibility
- 18 Years to 70 Years
- Enrollment
- 23 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2014 – 2019
- U.S. locations
- 2
- States / cities
- Aurora, Colorado • Pittsburgh, Pennsylvania
- Conditions
- Vitamin D Deficiency
- Interventions
- 1,000 IU vitamin D2, placebo capsule, mushrooms, UVB-treated mushrooms, 400 IU vitamin D2, UVB-treated mushrooms, 1,000 IU vitamin D2
- Dietary Supplement · Other
- Lead sponsor
- USDA, Western Human Nutrition Research Center
- Federal
- Eligibility
- 20 Years to 59 Years
- Enrollment
- 48 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2010 – 2011
- U.S. locations
- 1
- States / cities
- Davis, California
- Conditions
- Cancer, Cardiovascular Disease
- Interventions
- vitamin D3, omega-3 fatty acids (fish oil), Vitamin D3 placebo, Fish oil placebo
- Dietary Supplement · Drug
- Lead sponsor
- Brigham and Women's Hospital
- Other
- Eligibility
- 50 Years and older
- Enrollment
- 25,871 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2010 – 2026
- U.S. locations
- 1
- States / cities
- Boston, Massachusetts
- Conditions
- Muscle Power
- Interventions
- Vitamin D, Placebo
- Dietary Supplement
- Lead sponsor
- Oklahoma State University
- Other
- Eligibility
- 18 Years to 35 Years
- Enrollment
- 103 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2012 – 2013
- U.S. locations
- 1
- States / cities
- Stillwater, Oklahoma
- Conditions
- Solid Tumors
- Interventions
- Doxercalciferol
- Drug
- Lead sponsor
- M.D. Anderson Cancer Center
- Other
- Eligibility
- 2 Years to 26 Years
- Enrollment
- 1 participant
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2007 – 2010
- U.S. locations
- 1
- States / cities
- Houston, Texas
- Conditions
- Breast Cancer
- Interventions
- Celecoxib, Placebo, Cholecalciferol
- Drug
- Lead sponsor
- Hartford Hospital
- Other
- Eligibility
- 18 Years and older · Female only
- Enrollment
- 45 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2008 – 2016
- U.S. locations
- 1
- States / cities
- Grand Forks, North Dakota
- Conditions
- Healthy, no Evidence of Disease
- Interventions
- cholecalciferol, questionnaire administration, trivalent influenza vaccine
- Dietary Supplement · Other · Biological
- Lead sponsor
- Roswell Park Cancer Institute
- Other
- Eligibility
- 18 Years to 64 Years
- Enrollment
- 11 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2011 – 2015
- U.S. locations
- 1
- States / cities
- Buffalo, New York
- Conditions
- Hyperphosphatemia
- Interventions
- Niacinamide, Placebo
- Drug
- Lead sponsor
- Washington University School of Medicine
- Other
- Eligibility
- 18 Years and older
- Enrollment
- 17 participants
- Timeline
- 2006 – 2007
- U.S. locations
- 1
- States / cities
- St Louis, Missouri
- Conditions
- Vitamin D Deficiency, HIV
- Interventions
- Vitamin D
- Dietary Supplement
- Lead sponsor
- University of California, Los Angeles
- Other
- Eligibility
- 18 Years to 90 Years
- Enrollment
- 122 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2010 – 2012
- U.S. locations
- 1
- States / cities
- Los Angeles, California
- Conditions
- Heart Failure
- Interventions
- Paricalcitol
- Drug
- Lead sponsor
- Massachusetts General Hospital
- Other
- Eligibility
- 18 Years and older
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2014
- U.S. locations
- 1
- States / cities
- Boston, Massachusetts
- Conditions
- Hypovitaminosis D
- Interventions
- vitamin D supplementation
- Dietary Supplement
- Lead sponsor
- University of Wisconsin, Madison
- Other
- Eligibility
- 18 Years and older
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- Started 2005
- U.S. locations
- 1
- States / cities
- Madison, Wisconsin
- Conditions
- Vitamin D Deficiency
- Interventions
- Cholecalciferol
- Dietary Supplement
- Lead sponsor
- Children's Hospital of Philadelphia
- Other
- Eligibility
- 12 Years to 17 Years
- Enrollment
- 39 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2011 – 2012
- U.S. locations
- 1
- States / cities
- Philadelphia, Pennsylvania
- Conditions
- Renal Insufficiency, Chronic, Kidney Failure, Chronic
- Interventions
- Vitamin D
- Drug
- Lead sponsor
- University of Nebraska
- Other
- Eligibility
- 21 Years to 70 Years
- Enrollment
- 5 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2019 – 2020
- U.S. locations
- 1
- States / cities
- Omaha, Nebraska
- Conditions
- Low 25-hydroxyvitamin D Concentrations
- Interventions
- Vitamin D3
- Dietary Supplement
- Lead sponsor
- Wake Forest University Health Sciences
- Other
- Eligibility
- 65 Years to 89 Years
- Enrollment
- 15 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2014 – 2017
- U.S. locations
- 1
- States / cities
- Winston-Salem, North Carolina
- Conditions
- Stage, Colon Cancer, Stage I-III Colon Cancer, Stage IV Colon Cancer With Resectable Liver Metastases
- Interventions
- Vitamin D3, Placebo
- Drug
- Lead sponsor
- Dana-Farber Cancer Institute
- Other
- Eligibility
- 18 Years and older
- Enrollment
- 80 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2014 – 2027
- U.S. locations
- 1
- States / cities
- Boston, Massachusetts
- Conditions
- Hypophosphatasia (HPP)
- Interventions
- asfotase alfa
- Biological
- Lead sponsor
- Alexion Pharmaceuticals, Inc.
- Industry
- Eligibility
- Up to 36 Months
- Enrollment
- 11 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2008 – 2010
- U.S. locations
- 6
- States / cities
- Little Rock, Arkansas • Wilmington, Delaware • Springfield, Missouri + 3 more
- Conditions
- Colorectal Cancer
- Interventions
- Vitamin D3 (cholecalciferol), Placebo
- Drug
- Lead sponsor
- University of Illinois at Chicago
- Other
- Eligibility
- 50 Years and older
- Enrollment
- 55 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2008 – 2011
- U.S. locations
- 1
- States / cities
- Chicago, Illinois