{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+%28cholecalciferol%29&page=25",
    "query": {
      "intervention": "Vitamin D (cholecalciferol)",
      "page": 25
    },
    "page_size": 10
  },
  "pagination": {
    "page": 25,
    "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=26&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vitamin+D+%28cholecalciferol%29&page=24&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-15T18:16:03.421Z",
  "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": "NCT01125436",
      "title": "A Trial of Vitamin D Therapy in Patients With Heart Failure",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Heart Failure"
      ],
      "interventions": [
        {
          "name": "Cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Case Western Reserve University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 64,
      "start_date": "2008-07",
      "completion_date": "2011-09",
      "has_results": true,
      "last_update_posted_date": "2022-08-10",
      "last_synced_at": "2026-10-15T18:16:03.421Z",
      "location_count": 1,
      "location_summary": "Cleveland, Ohio",
      "locations": [
        {
          "city": "Cleveland",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01125436"
    },
    {
      "nct_id": "NCT03734744",
      "title": "PK/PD of Vitamin D3 in Adults With CF",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vitamin D Deficiency",
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "University of Southern California",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 6,
      "start_date": "2019-06-17",
      "completion_date": "2022-05-16",
      "has_results": false,
      "last_update_posted_date": "2022-05-17",
      "last_synced_at": "2026-10-15T18:16:03.421Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03734744"
    },
    {
      "nct_id": "NCT01992263",
      "title": "Vitamin D Supplementation and TB",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Tuberculosis",
        "Vitamin D",
        "Immunity"
      ],
      "interventions": [
        {
          "name": "Vitamin D (600 IU)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D (2000 IU)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D (4000 IU)",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Cornell University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "18 Years to 60 Years"
      },
      "enrollment_count": 200,
      "start_date": "2021-06",
      "completion_date": "2023-02",
      "has_results": false,
      "last_update_posted_date": "2020-09-09",
      "last_synced_at": "2026-10-15T18:16:03.421Z",
      "location_count": 1,
      "location_summary": "Ithaca, New York",
      "locations": [
        {
          "city": "Ithaca",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01992263"
    },
    {
      "nct_id": "NCT00208793",
      "title": "Calcium and Vitamin D vs Markers of Adenomatous Polyps",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Colorectal Adenomatous Polyps"
      ],
      "interventions": [
        {
          "name": "Calcium and vitamin D3 combined",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        },
        {
          "name": "Calcium",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Vitamin D3",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DRUG"
      ],
      "sponsor": "Emory University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": "74 Years",
        "sex": "ALL",
        "summary": "30 Years to 74 Years"
      },
      "enrollment_count": 92,
      "start_date": "2005-05",
      "completion_date": "2013-02",
      "has_results": false,
      "last_update_posted_date": "2013-11-26",
      "last_synced_at": "2026-10-15T18:16:03.421Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00208793"
    },
    {
      "nct_id": "NCT06158932",
      "title": "A Single Group Study to Evaluate the Effects of a Myo-Inositol and D-Chiro Inositol Supplement on Symptoms Associated With Polycystic Ovary Syndrome and Hormone Imbalance",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Polycystic Ovary Syndrome",
        "Hormone Imbalance"
      ],
      "interventions": [
        {
          "name": "Optify Myo Inositol and D-Chiro Inositol Plus Folate and Vitamin D supplement",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Optify",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 55 Years · Female only"
      },
      "enrollment_count": 40,
      "start_date": "2023-09-08",
      "completion_date": "2024-01-06",
      "has_results": false,
      "last_update_posted_date": "2024-04-03",
      "last_synced_at": "2026-10-15T18:16:03.421Z",
      "location_count": 1,
      "location_summary": "Santa Monica, California",
      "locations": [
        {
          "city": "Santa Monica",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06158932"
    },
    {
      "nct_id": "NCT01787409",
      "title": "Cholecalciferol in Improving Survival in Patients With Newly Diagnosed Cancer With Vitamin D Insufficiency",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Aggressive Non-Hodgkin Lymphoma",
        "Anaplastic Large Cell Lymphoma",
        "Angioimmunoblastic T-Cell Lymphoma",
        "Chronic Lymphocytic Leukemia",
        "Diffuse Large B-Cell Lymphoma",
        "Enteropathy-Associated T-Cell Lymphoma",
        "Hepatosplenic T-Cell Lymphoma",
        "Mature T-Cell and NK-Cell Non-Hodgkin Lymphoma",
        "Mediastinal (Thymic) Large B-Cell Lymphoma",
        "Nasal Type Extranodal NK/T-Cell Lymphoma",
        "Peripheral T-Cell Lymphoma, Not Otherwise Specified",
        "Primary Cutaneous Anaplastic Large Cell Lymphoma",
        "Refractory Anaplastic Large Cell Lymphoma",
        "Small Lymphocytic Lymphoma",
        "Subcutaneous Panniculitis-Like T-Cell Lymphoma"
      ],
      "interventions": [
        {
          "name": "Cholecalciferol",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "OTHER"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 565,
      "start_date": "2013-03-06",
      "completion_date": "2028-06-30",
      "has_results": false,
      "last_update_posted_date": "2026-06-16",
      "last_synced_at": "2026-10-15T18:16:03.421Z",
      "location_count": 5,
      "location_summary": "Scottsdale, Arizona • Atlanta, Georgia • Iowa City, Iowa + 2 more",
      "locations": [
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Iowa City",
          "state": "Iowa"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01787409"
    },
    {
      "nct_id": "NCT00001242",
      "title": "Studies of States With Resistance to Vitamin D and Parathyroid Hormone",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hypocalcemia",
        "Pseudohypoparathyroidism",
        "Osteomalacia",
        "Rickets",
        "Pseudopseudohpoparathyroidism"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "2 Months",
        "maximum_age": "100 Years",
        "sex": "ALL",
        "summary": "2 Months to 100 Years"
      },
      "enrollment_count": 70,
      "start_date": "1997-08-12",
      "completion_date": "2022-12-12",
      "has_results": false,
      "last_update_posted_date": "2023-01-20",
      "last_synced_at": "2026-10-15T18:16:03.421Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00001242"
    },
    {
      "nct_id": "NCT04826133",
      "title": "Vitamin D and Cocaine Administration",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Cocaine Use Disorder"
      ],
      "interventions": [
        {
          "name": "Calcitriol",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Yale University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "30 Years to 55 Years"
      },
      "enrollment_count": 4,
      "start_date": "2019-03-27",
      "completion_date": "2020-01-17",
      "has_results": false,
      "last_update_posted_date": "2023-08-14",
      "last_synced_at": "2026-10-15T18:16:03.421Z",
      "location_count": 1,
      "location_summary": "New Haven, Connecticut",
      "locations": [
        {
          "city": "New Haven",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04826133"
    },
    {
      "nct_id": "NCT01425424",
      "title": "Prediabetes, Prehypertension and Vitamin D Supplementation - A Practice Based Clinical Intervention Pilot Study",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Prediabetes",
        "Prehypertension"
      ],
      "interventions": [
        {
          "name": "Vitamin D supplementation",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Pennington Biomedical Research Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 18,
      "start_date": "2012-04",
      "completion_date": "2013-12",
      "has_results": false,
      "last_update_posted_date": "2015-12-18",
      "last_synced_at": "2026-10-15T18:16:03.421Z",
      "location_count": 7,
      "location_summary": "Baton Rouge, Louisiana • Covington, Louisiana • Durham, North Carolina + 1 more",
      "locations": [
        {
          "city": "Baton Rouge",
          "state": "Louisiana"
        },
        {
          "city": "Baton Rouge",
          "state": "Louisiana"
        },
        {
          "city": "Baton Rouge",
          "state": "Louisiana"
        },
        {
          "city": "Baton Rouge",
          "state": "Louisiana"
        },
        {
          "city": "Covington",
          "state": "Louisiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01425424"
    },
    {
      "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": "2026-10-15T18:16:03.421Z",
      "location_count": 1,
      "location_summary": "Columbia, Missouri",
      "locations": [
        {
          "city": "Columbia",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00572104"
    }
  ]
}