{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+%28cholecalciferol%29&page=22",
    "query": {
      "intervention": "Vitamin D (cholecalciferol)",
      "page": 22
    },
    "page_size": 10
  },
  "pagination": {
    "page": 22,
    "page_size": 10,
    "total_count": 960,
    "total_pages": 96,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+%28cholecalciferol%29&page=23&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+%28cholecalciferol%29&page=21&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-15T12:23:17.737Z",
  "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": "NCT01835639",
      "title": "Vitamin D Supplementation in Glomerular Disease",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Glomerular Disease"
      ],
      "interventions": [
        {
          "name": "Cholecalciferol, 2000 or 4000 IUs by mouth daily for 12 weeks",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Children's Hospital of Philadelphia",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "5 Years",
        "maximum_age": "30 Years",
        "sex": "ALL",
        "summary": "5 Years to 30 Years"
      },
      "enrollment_count": 32,
      "start_date": "2013-04",
      "completion_date": "2017-09",
      "has_results": false,
      "last_update_posted_date": "2019-08-12",
      "last_synced_at": "2026-10-15T12:23:17.737Z",
      "location_count": 5,
      "location_summary": "Wilmington, Delaware • Baltimore, Maryland • New Hyde Park, New York + 1 more",
      "locations": [
        {
          "city": "Wilmington",
          "state": "Delaware"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "New Hyde Park",
          "state": "New York"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01835639"
    },
    {
      "nct_id": "NCT02877641",
      "title": "Cholecalciferol Supplementation in Strengthening Inspiratory Muscles in Cholecalciferol-Deficient Patients With Chronic Obstructive Pulmonary Disease",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Chronic Obstructive Pulmonary Disease",
        "Muscle Weakness"
      ],
      "interventions": [
        {
          "name": "Cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        },
        {
          "name": "Multivitamin",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        },
        {
          "name": "Questionnaire Administration",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Roswell Park Cancer Institute",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 4,
      "start_date": "2014-04-16",
      "completion_date": "2017-02-01",
      "has_results": false,
      "last_update_posted_date": "2017-02-15",
      "last_synced_at": "2026-10-15T12:23:17.737Z",
      "location_count": 1,
      "location_summary": "Buffalo, New York",
      "locations": [
        {
          "city": "Buffalo",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02877641"
    },
    {
      "nct_id": "NCT04120064",
      "title": "Treatment of Vitamin D Deficiency With Large Bolus Cholecalciferol",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Vitamin D Deficiency"
      ],
      "interventions": [
        {
          "name": "Cholecalciferol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Parkview Medical Center",
      "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": 60,
      "start_date": "2019-01-25",
      "completion_date": "2021-01-15",
      "has_results": false,
      "last_update_posted_date": "2021-02-01",
      "last_synced_at": "2026-10-15T12:23:17.737Z",
      "location_count": 1,
      "location_summary": "Pueblo, Colorado",
      "locations": [
        {
          "city": "Pueblo",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04120064"
    },
    {
      "nct_id": "NCT01262300",
      "title": "Vitamin D Supplementation And Varicella Zoster Virus Vaccine Responsiveness In Older Long-Term Care Residents",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Immunosenescence",
        "Shingles"
      ],
      "interventions": [
        {
          "name": "Varicella Zoster Virus Vaccine (Zostavax)",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "University of Colorado, Denver",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "60 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "60 Years and older"
      },
      "enrollment_count": 33,
      "start_date": "2010-11",
      "completion_date": "2014-01-23",
      "has_results": false,
      "last_update_posted_date": "2021-06-25",
      "last_synced_at": "2026-10-15T12:23:17.737Z",
      "location_count": 1,
      "location_summary": "Aurora, Colorado",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01262300"
    },
    {
      "nct_id": "NCT01093092",
      "title": "Calcitriol, Cisplatin, and Gemcitabine Hydrochloride in Treating Patients With Advanced Solid Tumors That Cannot Be Removed by Surgery",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Adult Solid Neoplasm"
      ],
      "interventions": [
        {
          "name": "Calcitriol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Cisplatin",
          "type": "DRUG"
        },
        {
          "name": "Gemcitabine Hydrochloride",
          "type": "DRUG"
        },
        {
          "name": "Pharmacological Study",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Roswell Park Cancer Institute",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 14,
      "start_date": "2011-09",
      "completion_date": "2015-11",
      "has_results": false,
      "last_update_posted_date": "2016-01-12",
      "last_synced_at": "2026-10-15T12:23:17.737Z",
      "location_count": 2,
      "location_summary": "Buffalo, New York • Charlottesville, Virginia",
      "locations": [
        {
          "city": "Buffalo",
          "state": "New York"
        },
        {
          "city": "Charlottesville",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01093092"
    },
    {
      "nct_id": "NCT01759771",
      "title": "Vitamin D3 Supplementation for Low-Risk Prostate Cancer: A Randomized Trial",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Prostate Cancer"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "VA Office of Research and Development",
      "sponsor_class": "FED",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": "90 Years",
        "sex": "MALE",
        "summary": "19 Years to 90 Years · Male only"
      },
      "enrollment_count": 130,
      "start_date": "2013-01-03",
      "completion_date": "2020-05-11",
      "has_results": true,
      "last_update_posted_date": "2024-03-18",
      "last_synced_at": "2026-10-15T12:23:17.737Z",
      "location_count": 2,
      "location_summary": "Charleston, South Carolina",
      "locations": [
        {
          "city": "Charleston",
          "state": "South Carolina"
        },
        {
          "city": "Charleston",
          "state": "South Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01759771"
    },
    {
      "nct_id": "NCT02272101",
      "title": "Rhinitis in the Elderly: The Role of Vitamin D",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Rhinitis"
      ],
      "interventions": [
        {
          "name": "Vitamin D versus placebo",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Rohr and Columbo Asthma, Allergy and Immunology Specialists, P.C.",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "65 Years and older"
      },
      "enrollment_count": 15,
      "start_date": "2013-11",
      "completion_date": "2014-03",
      "has_results": false,
      "last_update_posted_date": "2014-10-22",
      "last_synced_at": "2026-10-15T12:23:17.737Z",
      "location_count": 2,
      "location_summary": "Bryn Mawr, Pennsylvania",
      "locations": [
        {
          "city": "Bryn Mawr",
          "state": "Pennsylvania"
        },
        {
          "city": "Bryn Mawr",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02272101"
    },
    {
      "nct_id": "NCT01409681",
      "title": "A Multi-Centered Trial Evaluating the Role of Vitamin D Metabolism in Non-Small Cell Lung Cancer",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Non-Small Cell Lung Cancer"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Michigan Rogel Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "18 Years to 80 Years"
      },
      "enrollment_count": 41,
      "start_date": "2011-05",
      "completion_date": "2013-12",
      "has_results": false,
      "last_update_posted_date": "2014-03-31",
      "last_synced_at": "2026-10-15T12:23:17.737Z",
      "location_count": 2,
      "location_summary": "Ann Arbor, Michigan",
      "locations": [
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        },
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01409681"
    },
    {
      "nct_id": "NCT03032328",
      "title": "Vitamin D Deficiency and Dysautonomia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency",
        "Orthostatic Intolerance",
        "Nausea"
      ],
      "interventions": [
        {
          "name": "vitamin D supplement",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Wake Forest University Health Sciences",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "10 Years",
        "maximum_age": "18 Years",
        "sex": "ALL",
        "summary": "10 Years to 18 Years"
      },
      "enrollment_count": 31,
      "start_date": "2016-06",
      "completion_date": "2022-12-21",
      "has_results": false,
      "last_update_posted_date": "2023-01-27",
      "last_synced_at": "2026-10-15T12:23:17.737Z",
      "location_count": 1,
      "location_summary": "Winston-Salem, North Carolina",
      "locations": [
        {
          "city": "Winston-Salem",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03032328"
    },
    {
      "nct_id": "NCT04334512",
      "title": "A Study of Quintuple Therapy to Treat COVID-19 Infection",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "COVID-19",
        "Corona Virus Infection",
        "Coronavirus-19",
        "Sars-CoV2"
      ],
      "interventions": [
        {
          "name": "Hydroxychloroquine",
          "type": "DRUG"
        },
        {
          "name": "Azithromycin",
          "type": "DRUG"
        },
        {
          "name": "Vitamin C",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Zinc",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "ProgenaBiome",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 118,
      "start_date": "2020-06-22",
      "completion_date": "2024-02-27",
      "has_results": false,
      "last_update_posted_date": "2024-02-29",
      "last_synced_at": "2026-10-15T12:23:17.737Z",
      "location_count": 1,
      "location_summary": "Ventura, California",
      "locations": [
        {
          "city": "Ventura",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04334512"
    }
  ]
}