{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+%28cholecalciferol%29&page=17",
    "query": {
      "intervention": "Vitamin D (cholecalciferol)",
      "page": 17
    },
    "page_size": 10
  },
  "pagination": {
    "page": 17,
    "page_size": 10,
    "total_count": 959,
    "total_pages": 96,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+%28cholecalciferol%29&page=18&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+%28cholecalciferol%29&page=16&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-15T00:40:29.338Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT00511017",
      "title": "Doxercalciferol in Recurrent Pediatric Solid Tumors",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Solid Tumors"
      ],
      "interventions": [
        {
          "name": "Doxercalciferol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "M.D. Anderson Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "2 Years",
        "maximum_age": "26 Years",
        "sex": "ALL",
        "summary": "2 Years to 26 Years"
      },
      "enrollment_count": 1,
      "start_date": "2007-08",
      "completion_date": "2010-09",
      "has_results": false,
      "last_update_posted_date": "2012-07-31",
      "last_synced_at": "2026-10-15T00:40:29.338Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00511017"
    },
    {
      "nct_id": "NCT01007799",
      "title": "Vitamin D for Chronic Sinusitis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Chronic Sinusitis"
      ],
      "interventions": [
        {
          "name": "vitamin D placebo",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Chicago",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 30,
      "start_date": "2009-11",
      "completion_date": "2011-09",
      "has_results": false,
      "last_update_posted_date": "2016-08-26",
      "last_synced_at": "2026-10-15T00:40:29.338Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01007799"
    },
    {
      "nct_id": "NCT00572104",
      "title": "Efficacy of Plyometrics to Increase Bone Mass in Men With Osteopenia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Osteopenia"
      ],
      "interventions": [
        {
          "name": "resistance exercise",
          "type": "OTHER"
        },
        {
          "name": "plyometric exercise",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Missouri-Columbia",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "25 Years",
        "maximum_age": "60 Years",
        "sex": "MALE",
        "summary": "25 Years to 60 Years · Male only"
      },
      "enrollment_count": 38,
      "start_date": "2008-01",
      "completion_date": "2013-11",
      "has_results": false,
      "last_update_posted_date": "2016-10-07",
      "last_synced_at": "2026-10-15T00:40:29.338Z",
      "location_count": 1,
      "location_summary": "Columbia, Missouri",
      "locations": [
        {
          "city": "Columbia",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00572104"
    },
    {
      "nct_id": "NCT01426347",
      "title": "Treatment of Vitamin D Deficiency in Patients With Rheumatoid Arthritis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Rheumatoid Arthritis",
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Placebo sugar pill",
          "type": "DRUG"
        },
        {
          "name": "Ergocalciferol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Johns Hopkins University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "18 Years to 75 Years"
      },
      "enrollment_count": 139,
      "start_date": "2009-01",
      "completion_date": "2012-01",
      "has_results": true,
      "last_update_posted_date": "2017-03-20",
      "last_synced_at": "2026-10-15T00:40:29.338Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01426347"
    },
    {
      "nct_id": "NCT02138838",
      "title": "Efficacy and Safety of Cinacalcet in Pediatric Patients With Secondary Hyperparathyroidism (SHPT) and Chronic Kidney Disease (CKD) on Dialysis",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Chronic Kidney Disease, Secondary Hyperparathyroidism"
      ],
      "interventions": [
        {
          "name": "Cinacalcet HCl",
          "type": "DRUG"
        },
        {
          "name": "Standard of Care",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Amgen",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "6 Years to 17 Years"
      },
      "enrollment_count": 55,
      "start_date": "2014-11-07",
      "completion_date": "2016-06-23",
      "has_results": true,
      "last_update_posted_date": "2020-06-29",
      "last_synced_at": "2026-10-15T00:40:29.338Z",
      "location_count": 26,
      "location_summary": "Los Angeles, California • Wilmington, Delaware • Atlanta, Georgia + 22 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Wilmington",
          "state": "Delaware"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Iowa City",
          "state": "Iowa"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02138838"
    },
    {
      "nct_id": "NCT00153816",
      "title": "Vitamin D/Calcium Polyp Prevention Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Colorectal Cancer",
        "Polyps",
        "Adenomas"
      ],
      "interventions": [
        {
          "name": "Calcium Carbonate",
          "type": "DRUG"
        },
        {
          "name": "Vitamin D3",
          "type": "DRUG"
        },
        {
          "name": "placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Dartmouth-Hitchcock Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "45 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "45 Years to 75 Years"
      },
      "enrollment_count": 2813,
      "start_date": "2004-07",
      "completion_date": "2016-06",
      "has_results": true,
      "last_update_posted_date": "2017-03-15",
      "last_synced_at": "2026-10-15T00:40:29.338Z",
      "location_count": 10,
      "location_summary": "Los Angeles, California • Denver, Colorado • Atlanta, Georgia + 7 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Denver",
          "state": "Colorado"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Iowa City",
          "state": "Iowa"
        },
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00153816"
    },
    {
      "nct_id": "NCT00732758",
      "title": "Defining Vitamin D Insufficiency in School Age Children: A Randomized Placebo Controlled Trial of Vitamin D3",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "Vitamin D3 1000 IU",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo Tablet",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Pittsburgh",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "8 Years",
        "maximum_age": "14 Years",
        "sex": "ALL",
        "summary": "8 Years to 14 Years"
      },
      "enrollment_count": 157,
      "start_date": "2008-10",
      "completion_date": "2011-10",
      "has_results": true,
      "last_update_posted_date": "2015-12-29",
      "last_synced_at": "2026-10-15T00:40:29.338Z",
      "location_count": 1,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00732758"
    },
    {
      "nct_id": "NCT04965233",
      "title": "Using a Telemedicine Approach in a Genome-wide Association Study of Atopic Dermatitis - Searching for Novel Biomarkers in Clinically Relevant Phenotypes",
      "overall_status": "WITHDRAWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Atopic Dermatitis",
        "Eczema",
        "DNA"
      ],
      "interventions": [
        {
          "name": "DNA reports",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Information reports",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Studies&Me",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 0,
      "start_date": "2020-11-30",
      "completion_date": "2021-12-31",
      "has_results": false,
      "last_update_posted_date": "2021-09-20",
      "last_synced_at": "2026-10-15T00:40:29.338Z",
      "location_count": 1,
      "location_summary": "Redwood City, California",
      "locations": [
        {
          "city": "Redwood City",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04965233"
    },
    {
      "nct_id": "NCT02936999",
      "title": "Vitamin D Supplementation in Women With DCIS and/or LCIS",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Cholecalciferol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Inova Health Care Services",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 8,
      "start_date": "2016-08",
      "completion_date": "2019-01",
      "has_results": true,
      "last_update_posted_date": "2020-12-16",
      "last_synced_at": "2026-10-15T00:40:29.338Z",
      "location_count": 1,
      "location_summary": "Fairfax, Virginia",
      "locations": [
        {
          "city": "Fairfax",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02936999"
    },
    {
      "nct_id": "NCT02271230",
      "title": "Intervention With Vitamin D and Omega-3 Supplements and Incident Heart Failure",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Heart Failure"
      ],
      "interventions": [
        {
          "name": "Vitamin D and fish oil",
          "type": "DRUG"
        },
        {
          "name": "Fish oil (EPA/DHA) alone",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D alone",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Brigham and Women's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 25871,
      "start_date": "2014-08",
      "completion_date": "2019-12",
      "has_results": true,
      "last_update_posted_date": "2022-03-18",
      "last_synced_at": "2026-10-15T00:40:29.338Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02271230"
    }
  ]
}